Allow language definitions to have strings

Some musings on file size from the Closure Compiler service.

Before:

Original Size: 	2.56KB gzipped (12.34KB uncompressed)
Compiled Size: 	1.77KB gzipped (7.79KB uncompressed)

After:

Original Size: 	2.58KB gzipped (11.5KB uncompressed)
Compiled Size: 	1.77KB gzipped (7.06KB uncompressed)

So we've INCREASED the gzipped original size by a little, kept the
compiled gzipped size the same, and decreased the uncompressed sizes a
fair bit.
We should be ES3 compatible
Add Turkish to package.json keywords
Bump versions in devDependencies
Tests for package.json and bower.json
Update keywords in bower.json
2.1.0