Update for compiler 0.12

[thomashoneyman]

Hey folks -- this PR is an extension of the version bump that @justinwoo has already provided. If it isn't adding enough on top I'm perfectly fine closing this in favor of his PR.

This PR passes the test suite.

Specifically this PR introduces:

• toCharArray and fromCharArray are now from Data.String.CodeUnits instead of Data.String. There has been discussion about when to use code units vs. code points and that may be worth considering before merging.
• 0.12 changes like renaming id to identity and removing effect rows
• I trimmed down the Bower dependencies to the core libraries used and which already bring in the rest of the transitive dependencies. However, if you'd rather be more explicit, I can re-introduce imports like transformers

However, this is not yet ready to merge: it's waiting on purescript-parsing but is proven to work using the open PR in that repository from @joncfoo. Once that is merged or similar action is taken this can be merged in as well.

[CLAassistant]

All committers have signed the CLA.

[davezuch]

This PR should now be ready to merge as the dependent PR for purescript-parsing has been merged and I've just fixed the bower config to point to it.

[natefaubion]

@garyb @cryogenian Can we merge this?

[thomashoneyman]

I believe Gary wanted to fix this before releasing:
#45

[cryogenian]

Going to merge this #45 could go into minor/patch release