Fully document PIL.Image from handbook
Fix many formatting mistakes in PIL.Image's docstrings
Fully document PIL.ImageChops
Improve ImageChops docstrings
Remove ImageChops from PIL.rst
Remove old ImageChops comments; redundant with docstrings
Fully document PIL.ImageColor
Fully document PIL.ImageDraw
Tweak PIL.rst namespace and description
Remove ImageDraw from PIL.rst
Clearer PIL.rst title
Move reference above appendices in ToC
Merge pull request #374 from irskep/doc-improvements

Port and update docs for Image, ImageChops, ImageColor, and ImageDraw