ENH: If a ufunc reduces frame to 0-d, return scalar. Needed for ndimage.
Merge pull request #30 from danielballan/ndarray-subclass

ENH: If a ufunc reduces frame to 0-d, return scalar. Needed for ndimage.
CLN/API: image_sequence subclasses FramesSequence; invert, gray replaced by process_func
ENH: Add working but minimal play() method to ImageSequence.
Merge pull request #32 from danielballan/play

Add play to render ImageSequence as HTML video tag in IPython notebook
BLD: Add mpl dep to Travis.