Merge remote-tracking branch 'origin/master' into markdownify

Author: adamvoss

examples.md

@@ -36,4 +36,4 @@ The two examples below are step-by-step guides into building a schema:
 -   [a simple example](example1.md) which covers a classical product catalog description.
 -   [a more advanced example](example2.md), using JSON Schema to describe filesystem entries in a Unix-like /etc/fstab file.
 
-The [Space Telescope Science Institute](http://www.stsci.edu/) has also published an [guide aimed at schema authors](http://spacetelescope.github.io/understanding-json-schema/).
+The [Space Telescope Science Institute](http://www.stsci.edu/) has also published a [guide aimed at schema authors](http://spacetelescope.github.io/understanding-json-schema/).

implementations.md

@@ -64,7 +64,8 @@ Validators
     -   <a href="https://github.com/everit-org/json-schema" id="link-impl-everit-json-schema">json-schema (implementation based on the org.json API)</a> - *supports version 4* (Apache License 2.0)
     -   <a href="https://github.com/networknt/json-schema-validator" id="link-impl-networknt-json-schema">json-schema-validator</a> - *supports version 4* (Apache License 2.0)
 - JavaScript <a id="validator-javascript"></a>
-    -   <a href="https://github.com/epoberezkin/ajv" id="link-impl-ajv">ajv</a> for Node.js and the browser - *supports version 4, validation keywords and $data reference from [version 5 proposals](https://github.com/json-schema/json-schema/wiki/v5-Proposals)* (MIT)
+    -   <a href="https://github.com/epoberezkin/ajv" id="link-impl-ajv">ajv</a> for Node.js and browsers - *supports version 4, version 6, [custom keywords](https://github.com/epoberezkin/ajv-keywords) and [$data reference](https://github.com/json-schema-org/json-schema-spec/issues/51)* (MIT)
+    -   <a href="https://github.com/korzio/djv" id="link-impl-djv">djv</a> for Node.js and browsers - *supports version 4* (MIT)
     -   <a href="https://github.com/tdegrunt/jsonschema" id="link-impl-tdegrunt-jsonschema">jsonschema</a> for Node.js - *supports version 4* (MIT)
     -   <a href="https://github.com/mafintosh/is-my-json-valid" id="link-impl-is-my-json-valid">is-my-json-valid</a> - *supports version 4* (MIT)
     -   <a href="http://geraintluff.github.com/tv4/" id="link-impl-tv4">tv4</a> - *supports version 4* (Public Domain)