Make Pillow a requirement

[Juan Nunez-Iglesias]

@jjhelmus and I are having a discussion regarding IO and how tests fail if
you don't have any of Pillow, PyQt, freeimage, etc, none of which are
actually a requirement. As one of the sprint topics is fixing up IO, this
would be a great thing to fix.

Cheap solution: make Pillow a requirement.

Expensive solution: write/pilfer our own  IO modules, however inefficient
they may be. (e.g. tifffile.py for tifs, maybe similar PNG)

I don't see any *other* solution. Making mpl a requirement is not useful
since their IO is also broken (e.g. images convert to float by default).

Juan.
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