Haxe Ruby Target

This is a fork of Haxe that adds a ruby target (ruby version >= 1.9.3p194). The ruby target is limited and just me scratching my own itch, see https://twitter.com/fitzyfitzyfitzy/status/476463543844626432

To use the fork: first, get comfortable compiling haxe from source (if you are not already), see https://github.com/HaxeFoundation/haxe#user-content-building-from-source

Then you can just substitute in the version at https://github.com/paulfitz/haxe (the ruby2 branch, set as default), and recompile. You should now have a -rb language option in haxe and be able to use it like any other target.