Extract OSX instructions into an OSX file
Fix a typo
More info about what to do with questions
Improvements to OSX_SETUP.md
Instructions for getting set up on Ubuntu

Tested in an Ubuntu 12.04 VM
Instructions for installing Homebrew.

Homebrew is necessary for installing binary dependencies from rvm.
Really barebones windows setup instructions
Merge pull request #2 from AndrewLorente/add_contribution_requirements_instructions

Add contribution requirements instructions