FIX: Correct Video.frame_shape and operate nicely with as_grey
FIX: Remove unused pix_fmt; raise dtype as NotImplmented
TST: Restore expected values to correct values.
FIX: Handle edge case of a flat image.
FIX: Make open() safe for classes with varying arg order.
ENH: Implemented dtype for PyAVReader.
TST: Test dtype functionality for all classes.
Merge pull request #100 from danielballan/fix-video-shape

FIX : Correct Video.frame_shape and operate nicely with as_grey