Renamed Haxe to HaXe

Hi,

We've just changed one letter from upper to lower case, so I hope it will be fine...

By the way, I've tried to test the upgrade process by changing the ``repository_channels`` setting to point to my version : 
https://raw.github.com/clemos/package_control_channel/master/repositories.json
Unfortunately, it fails with:
``Package Control: No CA certs available for raw.github.com. ``
Is there an actual way to test changes made to the "repositories.json" file for such situations ?

Thanks a lot for your work