Standardize black-white inversion across Frames subclasses.
Reverse order of annotate's args for consistency with circle.
All Frames count and shape attributes should be integer.
Circle handles KeyboardInterrupt silently and writes files of arbitrary size.
Merge branch 'better-circle'
New example
minor edit
Update example with new annotate API
update simple example
Remove file now unused by travis -- everything is under ci.
Add libtiff to .travis