Fixes sprite add to work with non-power of two subimages.
Refactors to fix image saving with no power of two textures
Fixes non-power of two sprite fonts
Fixes loops.
Removed extraneous include.
Fixes loading upside down bitmaps
Whoops had that backwards.
Fixes sprite add transparency
Fixes segfault.
Only needed done to the bottom not the top
Fix png loading to load the data upside down.
Add saving fixes, and works perfectly.
Merge pull request #654 from RobertBColton/master

Fixes Image Saving and Loading