Added examples of code blocks to the API page; changed heroku syntax for left TOC
Broke API pages into subpages, added subnav in /api section

To match current content development sketches in
http://invis.io/9YM2HYMP and http://invis.io/SMLUZ9K7.
Added gem pygmentize for code highlighting (not yet working)
Removed hack for auto-generated TOC on API pages.

Now not needed because of split subpages in /api.
Regenerated _site directory, changed .gitignore
New .gitignore so that _site isn't checked in.
Merge branch 'gh-pages' of https://github.com/alenbratanovic/Labs into gh-pages