diff --git a/.travis.yml b/.travis.yml
index 796d98f9..b4c55596 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,3 +1,19 @@
+sudo: false
+
 language: node_js
 node_js:
   - "0.12"
+
+addons:
+  apt:
+    sources:
+    - hvr-ghc
+    packages:
+    - cabal-install-1.22
+    - ghc-7.10.1
+
+
+before_install:
+ - export PATH=/opt/ghc/7.10.1/bin:/opt/cabal/1.22/bin:./Elm-Platform/0.15.1/.cabal-sandbox/bin:$PATH
+ - runhaskell BuildFromSource.hs 0.15.1
+ - export PATH="`pwd`"/Elm-Platform/0.15.1/.cabal-sandbox/bin:$PATH
diff --git a/BuildFromSource.hs b/BuildFromSource.hs
new file mode 100644
index 00000000..719741ba
--- /dev/null
+++ b/BuildFromSource.hs
@@ -0,0 +1,164 @@
+{-| This script builds any version of the Elm Platform from source.
+Before you use it, make sure you have the Haskell Platform with a recent
+version of cabal.
+
+To install a released version of Elm, you will run something like this:
+
+    runhaskell BuildFromSource.hs 0.15.1
+
+Before you do that, in some directory of your choosing, add
+wherever/Elm-Platform/0.15.1/.cabal-sandbox/bin to your PATH.
+
+Then, run the above. You will now actually have a new directory for the
+Elm Platform, like this:
+
+    Elm-Platform/0.15.1/
+        elm-make/        -- git repo for the build tool, ready to edit
+        elm-repl/        -- git repo for the REPL, ready to edit
+        ...
+        .cabal-sandbox/  -- various build files
+
+All of the executables you need are in .cabal-sandbox/bin, which is on
+your PATH and thus can be used from anywhere.
+
+You can build many versions of the Elm Platform, so it is possible to have
+Elm-Platform/0.15.1/ and Elm-Platform/0.13/ with no problems. It is up to you
+to manage your PATH variable or symlinks though.
+
+To get set up with the master branch of all Elm Platform projects, run this:
+
+    runhaskell BuildFromSource.hs master
+
+From there you can start developing on any of the projects, switching branches
+and testing interactions between projects.
+-}
+module Main where
+
+import qualified Data.List          as List
+import qualified Data.Map           as Map
+import           System.Directory   (createDirectoryIfMissing,
+                                     getCurrentDirectory, setCurrentDirectory)
+import           System.Environment (getArgs)
+import           System.Exit        (ExitCode, exitFailure)
+import           System.FilePath    ((</>))
+import           System.IO          (hPutStrLn, stderr)
+import           System.Process     (rawSystem)
+
+
+(=:) = (,)
+
+configs :: Map.Map String [(String, String)]
+configs =
+  Map.fromList
+    [
+      "master" =:
+        [ "elm-compiler" =: "master"
+        , "elm-package"  =: "master"
+        , "elm-make"     =: "master"
+        , "elm-reactor"  =: "master"
+        , "elm-repl"     =: "master"
+        ]
+    ,
+      "0.15.1" =:
+        [ "elm-compiler" =: "0.15.1"
+        , "elm-package"  =: "0.5.1"
+        , "elm-make"     =: "0.2"
+        ]
+    ,
+      "0.15" =:
+        [ "elm-compiler" =: "0.15"
+        , "elm-package"  =: "0.5"
+        , "elm-make"     =: "0.1.2"
+        , "elm-reactor"  =: "0.3.1"
+        , "elm-repl"     =: "0.4.1"
+        ]
+    ,
+      "0.14.1" =:
+        [ "elm-compiler" =: "0.14.1"
+        , "elm-package"  =: "0.4"
+        , "elm-make"     =: "0.1.1"
+        , "elm-reactor"  =: "0.3"
+        , "elm-repl"     =: "0.4"
+        ]
+    ,
+      "0.14" =:
+        [ "elm-compiler" =: "0.14"
+        , "elm-package"  =: "0.2"
+        , "elm-make"     =: "0.1"
+        , "elm-reactor"  =: "0.2"
+        , "elm-repl"     =: "0.4"
+        ]
+    ,
+      "0.13" =:
+        [ "Elm"         =: "0.13"
+        , "elm-reactor" =: "0.1"
+        , "elm-repl"    =: "0.3"
+        , "elm-get"     =: "0.1.3"
+        ]
+    ,
+      "0.12.3" =:
+        [ "Elm"        =: "0.12.3"
+        , "elm-server" =: "0.11.0.1"
+        , "elm-repl"   =: "0.2.2.1"
+        , "elm-get"    =: "0.1.2"
+        ]
+    ]
+
+
+main :: IO ()
+main =
+ do args <- getArgs
+    case args of
+      [version] | Map.member version configs ->
+          let artifactDirectory = "Elm-Platform" </> version
+              repos = configs Map.! version
+          in
+              makeRepos artifactDirectory version repos
+
+      _ ->
+        do hPutStrLn stderr $
+               "Expecting one of the following values as an argument:\n" ++
+               "    " ++ List.intercalate ", " (Map.keys configs)
+           exitFailure
+
+
+makeRepos :: FilePath -> String -> [(String, String)] -> IO ()
+makeRepos artifactDirectory version repos =
+ do createDirectoryIfMissing True artifactDirectory
+    setCurrentDirectory artifactDirectory
+    root <- getCurrentDirectory
+    mapM_ (uncurry (makeRepo root)) repos
+
+    cabal [ "update" ]
+
+    -- create a sandbox for installation
+    cabal [ "sandbox", "init" ]
+
+    -- add each of the sub-directories as a sandbox source
+    cabal ([ "sandbox", "add-source" ] ++ map fst repos)
+
+    -- install all of the packages together in order to resolve transitive dependencies robustly
+    -- (install the dependencies a bit more quietly than the elm packages)
+    cabal ([ "install", "-j", "--only-dependencies", "--ghc-options=\"-w\"" ] ++ (if version <= "0.15.1" then [ "--constraint=fsnotify<0.2" ] else []) ++ map fst repos)
+    cabal ([ "install", "-j", "--ghc-options=\"-XFlexibleContexts\"" ] ++ filter (/= "elm-reactor") (map fst repos))
+
+    return ()
+
+makeRepo :: FilePath -> String -> String -> IO ()
+makeRepo root projectName version =
+  do  -- get the right version of the repo
+    git [ "clone", "https://github.com/elm-lang/" ++ projectName ++ ".git" ]
+    setCurrentDirectory projectName
+    git [ "checkout", version, "--quiet" ]
+
+    -- move back into the root
+    setCurrentDirectory root
+
+
+-- HELPER FUNCTIONS
+
+cabal :: [String] -> IO ExitCode
+cabal = rawSystem "cabal"
+
+git :: [String] -> IO ExitCode
+git = rawSystem "git"
diff --git a/ci.sh b/ci.sh
index e25b223c..347c3e8b 100755
--- a/ci.sh
+++ b/ci.sh
@@ -2,31 +2,45 @@
 
 set -e
 
+function assertTestFailure() {
+  elm-package install --yes
+  elm-test "$1" | tee "$1".test.log
+  if test ${PIPESTATUS[0]} -ne 1; then
+    echo "$0: ERROR: $1: Expected tests to fail" >&2
+    exit 1
+  fi
+}
+
+function assertTestSuccess() {
+  elm-package install --yes
+  elm-test "$1" | tee "$1".test.log
+  if test ${PIPESTATUS[0]} -ne 0; then
+    echo "$0: ERROR: $1: Expected tests to pass" >&2
+    exit 1
+  fi
+}
+
 echo "$0: Installing elm-test..."
 npm install --global
 
+echo "$0: Testing examples..."
+cd examples
+assertTestSuccess PassingTests.elm
+assertTestFailure FailingTests.elm
+cd ..
+
 echo "$0: Testing elm-test init..."
 mkdir -p tmp
 cd tmp
 elm-test init --yes
-elm-test TestRunner.elm | tee test.log
-if test ${PIPESTATUS[0]} -ne 1; then
-  echo "$0: ERROR: Expected example tests to fail" >&2
-  exit 1
-fi
+assertTestFailure TestRunner.elm
+# delete the failing tests and the comma on the preceding line
+ex -c 'g/should fail/' -c 'd' -c 'g-1' -c 's/,$//' -c 'wq' Tests.elm
+rm -Rf elm-stuff
+assertTestSuccess TestRunner.elm
 cd ..
 rm -Rf tmp
 
-echo "$0: Testing examples..."
-cd examples
-elm-package install --yes
-elm-test Test.elm | tee test.log
-if test ${PIPESTATUS[0]} -ne 1; then
-  echo "$0: ERROR: Expected example tests to fail" >&2
-  exit 1
-fi
-cd ..
-
 echo ""
 echo "$0: Everything looks good!"
 echo "                                                            "
diff --git a/elm-io-ports.js b/elm-io-ports.js
index 1d662255..bc0c3682 100644
--- a/elm-io-ports.js
+++ b/elm-io-ports.js
@@ -1,45 +1,8 @@
-/* Implementation from: https://raw.githubusercontent.com/maxsnew/IO/master/elm-io.sh */
+/* Implementation from: https://github.com/laszlopandy/elm-console/blob/master/elm-io.sh */
 module.exports =
   "(function(){\n" +
   "    window = {Date: Date};\n" +
-  "    var stdin = process.stdin;\n" +
-  "    var fs    = require('fs');\n" +
-  "    var worker = Elm.worker(Elm.Main, {responses: null });\n" +
-  "    var just = function(v) {\n" +
-  "        return { 'Just': v};\n" +
-  "    }\n" +
-  "    var handle = function(request) {\n" +
-  "        switch(request.ctor) {\n" +
-  "        case 'Put':\n" +
-  "            process.stdout.write(request.val);\n" +
-  "            break;\n" +
-  "        case 'Get':\n" +
-  "            stdin.resume();\n" +
-  "            break;\n" +
-  "        case 'Exit':\n" +
-  "            process.exit(request.val);\n" +
-  "            break;\n" +
-  "        case 'WriteFile':\n" +
-  "            fs.writeFileSync(request.file, request.content);\n" +
-  "            break;\n" +
-  "        }\n" +
-  "    }\n" +
-  "    var handler = function(reqs) {\n" +
-  "        for (var i = 0; i < reqs.length; i++) {\n" +
-  "            handle(reqs[i]);\n" +
-  "        }\n" +
-  "        if (reqs.length > 0 && reqs[reqs.length - 1].ctor !== 'Get') {\n" +
-  "            worker.ports.responses.send(just(\"\"));\n" +
-  "        }\n" +
-  "    }\n" +
-  "    worker.ports.requests.subscribe(handler);\n" +
-  "    \n" +
-  "    // Read\n" +
-  "    stdin.on('data', function(chunk) {\n" +
-  "        stdin.pause();\n" +
-  "        worker.ports.responses.send(just(chunk.toString()));\n" +
-  "    })\n" +
-  "\n" +
-  "    // Start msg\n" +
-  "    worker.ports.responses.send(null);\n" +
+  "    if (typeof Elm === \"undefined\") { throw \"elm-io config error: Elm is not defined. Make sure you call elm-io with a real Elm output file\"}\n" +
+  "    if (typeof Elm.Main === \"undefined\" ) { throw \"Elm.Main is not defined, make sure your module is named Main.\" };\n" +
+  "    var worker = Elm.worker(Elm.Main);\n" +
   "})();\n";
diff --git a/examples/Test.elm b/examples/FailingTests.elm
similarity index 72%
rename from examples/Test.elm
rename to examples/FailingTests.elm
index 7794a0d7..ea1eb7b7 100644
--- a/examples/Test.elm
+++ b/examples/FailingTests.elm
@@ -7,10 +7,8 @@ import ElmTest.Assertion as A exposing (assertEqual, assert)
 import ElmTest.Run as R
 import ElmTest.Runner.Console exposing (runDisplay)
 import ElmTest.Test exposing (..)
-import IO.IO exposing (..)
-import IO.Runner exposing (Request, Response)
-import IO.Runner as Run
-
+import Console exposing (IO, run)
+import Task
 import String
 
 tests : Test
@@ -23,7 +21,5 @@ tests = suite "A Test Suite"
 console : IO ()
 console = runDisplay tests
 
-port requests : Signal Request
-port requests = Run.run responses console
-
-port responses : Signal Response
+port runner : Signal (Task.Task x ())
+port runner = run console
diff --git a/examples/PassingTests.elm b/examples/PassingTests.elm
new file mode 100644
index 00000000..4d296ebc
--- /dev/null
+++ b/examples/PassingTests.elm
@@ -0,0 +1,24 @@
+module Main where
+
+import Basics exposing (..)
+import Signal exposing (..)
+
+import ElmTest.Assertion as A exposing (assertEqual, assert)
+import ElmTest.Run as R
+import ElmTest.Runner.Console exposing (runDisplay)
+import ElmTest.Test exposing (..)
+import Console exposing (IO, run)
+import Task
+import String
+
+tests : Test
+tests = suite "A Test Suite"
+        [ test "Addition" (assertEqual (3 + 7) 10)
+        , test "String.left" (assertEqual "a" (String.left 1 "abcdefg"))
+        ]
+
+console : IO ()
+console = runDisplay tests
+
+port runner : Signal (Task.Task x ())
+port runner = run console
diff --git a/examples/elm-package.json b/examples/elm-package.json
index 23e7eca0..2f8cc1bd 100644
--- a/examples/elm-package.json
+++ b/examples/elm-package.json
@@ -8,9 +8,9 @@
     ],
     "exposed-modules": [],
     "dependencies": {
-        "elm-lang/core": "2.0.0 <= v < 3.0.0",
-        "deadfoxygrandpa/Elm-Test": "1.0.4 <= v <= 1.0.4",
-        "maxsnew/IO": "1.0.1 <= v <= 1.0.1"
+        "deadfoxygrandpa/elm-test": "2.0.0 <= v < 3.0.0",
+        "elm-lang/core": "2.0.0 <= v < 4.0.0",
+        "laszlopandy/elm-console": "1.0.1 <= v < 2.0.0"
     },
-    "elm-version": "0.15.0 <= v < 0.16.0"
+    "elm-version": "0.15.0 <= v < 0.17.0"
 }
diff --git a/templates/TestRunner.elm b/templates/TestRunner.elm
index b5109ee7..35f5be45 100644
--- a/templates/TestRunner.elm
+++ b/templates/TestRunner.elm
@@ -3,16 +3,13 @@ module Main where
 import Signal exposing (Signal)
 
 import ElmTest.Runner.Console exposing (runDisplay)
-import IO.IO exposing (IO)
-import IO.Runner exposing (Request, Response)
-import IO.Runner as Run
+import Console exposing (IO, run)
+import Task
 
 import Tests
 
 console : IO ()
 console = runDisplay Tests.all
 
-port requests : Signal Request
-port requests = Run.run responses console
-
-port responses : Signal Response
+port runner : Signal (Task.Task x ())
+port runner = run console
diff --git a/templates/elm-package.json b/templates/elm-package.json
index 7eff4ab8..4053c0e7 100644
--- a/templates/elm-package.json
+++ b/templates/elm-package.json
@@ -8,7 +8,7 @@
     ],
     "exposed-modules": [],
     "dependencies": {
-        "elm-lang/core": "3.0.0 <= v < 4.0.0"
+        "elm-lang/core": "2.0.0 <= v < 4.0.0"
     },
-    "elm-version": "0.16.0 <= v < 0.17.0"
+    "elm-version": "0.15.0 <= v < 0.17.0"
 }