work on the mask sprite and mods to the build script.
adjustments to make the build run in 32 bit.
Merge remote-tracking branch 'remotes/upstream/master'

Conflicts:
	default.build
fix for the windows phone 7 template project not building properly.
Merge pull request #237 from mono/master

Potential fix for font Descents on Android
Another go at the sprite mask class - fixed the return hit point and added the test case with mask files.
Merge remote-tracking branch 'remotes/upstream/master'
added the new masked sprite to all of the project files.
Merge pull request #239 from totallyeviljake/master

WP7 template mods and addition of the CCMaskedSprite class to handle bitmask collisions.