Fix effects in OSX project. Add CCEffectHue.

- Replaces CCEffectGlow with CCEffectBloom.
- Updates image paths in the bloom test to work on OSX.
- Adds CCEffectHue and a test for it. The hue adjustments are specified in degrees ranging from -180 to 180.
Looks like yes. I was wondering how that would avoid oversaturation, but you can only avoid it if you use a non-linear color space like HSV (which is too expensive for an effect shader anyway). In the past, I've just rotated around (1,1,1) and called it good enough. Transforming into a proper color space first looks like it helps a lot.

Can even make it a 4x4 transform and have the alpha pass-through. Handy.