Fully document PIL.ImageEnhance
Fix a couple of example imports
Document ImageFile.Parser
Comments identifying modules to skip documenting
Fully document PIL.ImageFilter
Fully document PIL.ImageFont
Fully document PIL.ImageGrab
Fully document ImageMath
Fully document PIL.ImageOps; fix some :py:mod: markup
Update PIL.rst to remove documented modules
Move ImageGrab docs back to ImageGrab.rst instead of autodoc
Merge pull request #375 from irskep/doc-improvements

Document ImageEnhance, ImageFile, ImageFilter, ImageFont, ImageGrab, ImageMath, and ImageOps