Document remaining Image* modules listed in PIL handbook

ImagePalette, ImagePath, ImageQt, ImageSequence, ImageStat, ImageTk, and ImageWin.

ImageTransform and ImageShow were not in the handbook so I didn't do it yet. I haven't decided how to organize the remaining modules (see PIL.rst). Suggestions would be helpful.

I'm not really sure why ImagePalette's methods are all marked experimental, or what ImageTransform is for.

[Preview in the usual place.](http://irskep-pillow.readthedocs.org/en/latest/)