adding ability to import and export PIL image objects from memory

[Adam F]

Hi,

I'm a first-time contributor to scikit-image. Me and my team ran into a 
problem yesterday - we want to import and export PIL images into 
scikit-image without reading or writing from disk. The current version of 
pil_plugin.py doesn't have APIs for this.

I refactored the plugin a bit to add APIs for importing and exporting PIL 
images directly. Here's the pull request:

https://github.com/scikit-image/scikit-image/pull/1083

I'm not sure who to ask - but will someone review this pull request and let 
me know if there are problems with it? Or if it could be improved?

cheers
adam
--
Adam Feuer
Seattle, WA, USA
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