Added setup for Leiningen and LightTable
Incorporate @seancorfield's suggestions
Added Heroku setup
Finished setup instructions (first draft)
Remove Homebrew reference; keep it simple
Added a bunch of Windows 8 instructions I don't understand

Need to test these myself
Add OS X-specific directions
Added Windows 7 setup
Add setup instructions for Windows 8.
Merge pull request #1 from bridgethillyer/setup

Add setup instructions for Windows 8.
Merge pull request #9 from cndreisbach/setup

Added setup for Leiningen and LightTable
Data Structures module complete