clean up Makefiles
Reformat: delete (see comments)

-> @MrKepzie
Think twice before redoing it:
- it should not rely on Transform3x3 (which represents aninvertible
transform by a 3x3 homography)
- it /could/ rely on ofxsFilter, but ofxsFilter is not optimized for
image resizing
- it should Crop also (so the first step is IMHO to write a Crop plugin)
Transform: fix rotation interact, allowing angles beyond the range [-180,180]