Merge pull request #217 from sssstest/master

add lower left pixel alpha transparency to sprite_add
More proper debugging macros and cleanup as well as more abstraction to shapes.
Merge pull request #219 from RobertBColton/master

More Box2D Improvements
Merge pull request #218 from sssstest/master

implement stripe sprite animation loading for sprite_add
implement loading 32 bit BMP in RGBA and ARGB in load_bitmap