Run Travis against Haxe 2.
Retry haxelib downloads when things mess up.

Which is too often.
First stab at automated Selenium testing.

Part of #92.
Oh right, this is Bash.
Travis tweaks.
Sauce twiddling.
Sauce only supports 3 parallel tests.
Fix a dumb IE9 loading issue.
Fix for IE9 file loading. The wonders of automated testing!
Soldier on when hitting audio decoding errors.
EmitterSprite fixes, thanks @volkipp.

Closes #96.
Fix locale detection in IE.
First-pass fixes for HXSL 2.0
Extend the asset format selection to images, and make it asynchronous.

For forthcoming WebP and JPEG XR support.
Add WebP support.

With fallback, 'natch. If you stick foobar.webp and foobar.png in your
assets, Chrome (and soon Firefox) will prefer to load the webp.
Add JPEG XR support.

Supported in IE and Flash/AIR.
Infer additional classpaths from the hxproj.

Closes #75.
Infer haxelibs from the hxproj.
Log when audio is unsupported/blacklisted.
Disable @:generic until it starts behaving.

Good grief: http://code.google.com/p/haxe/issues/detail?id=1683

Fixes #94, fixes #93.