Move Windows-specific bits into the Ruby Windows recipe
Remove FreeBSD-specific recipe
Remove OSX-specific cookbook
XCode command line tools are installed via build-essential now
Create /etc/profile.d automatically
Remove include_recipe for platform bits
Update copyrights
Update email for cookbook
Add @sethvargo as an author
Add @yzl as an author
Remove unused pkgutil cookbook
Remove unused pkgin cookbook
Update README formatting