Flask-images

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- INCOMPATIBILITY: Many things moved to flask.ext.images.core; `Images` and
`resized_img_src` remain.
- Compatible with Flask 0.9 (from 0.10).

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- Background colours are parsed by PIL; hex and html colours are now allowed.
- Fix for extension parsing bugs with URLs.

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- Fix regression introduced by 1.1.3 (such that remote images did not work).

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- Fix 3 security bugs, each of which would allow for reading any image on disk.

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- Depend on Pillow OR PIL.

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- Fix bug stopping remote images from working.