Switch to official highlight.js

https://github.com/isagalaev/highlight.js
Use hljs.registerLanguage instead legacy LANGUAGES
Build with latest highlight.js
Merge pull request #92 from nanoant/patch/official-hljs

Use official highlight.js
add bower.json
Merge pull request #96 from trumbitta/bower

add bower integration
Correct bundle location.
Only highlight code blocks.
Update to version 0.6.1.
Use bundled remark in tests.