Make HypRate a proper haxelib. 

Add haxelib.json
Add Mac and Mac64 directories as workarounds to make haxelib work.

See http://labe.me/en/blog/posts/2013-06-24-OpenFL-extension-2.html#.UlYCqGS_fNo for an example of this problem.  If you don't have those directories the haxelib will not function properly. Running haxelib path haxelibname results in an error like:

```
Library TestExtension version dev does not have a neko dll for your system
```

Joshua Granick explains why this is here in the irc logs: http://echelog.com/logs/browse/openfl/1381356000