Deprecating is_rgb()
Reverting the changes
Mentioned the Neurodebian repo in the install doc
DOC: Comment on the behavior of ``histogram`` for color images.
Deprecating is_gray and replacing it with is_gray_2d
Removing is_gray() and is_rgb()
Removing redundant imports used in previous commits
Fix spelling
Add skimage.viewer.qt wrapper.

This allows the viewer to use either PyQt4 or PySide as the toolkit.
Add PySide compatibility for save dialogs
Fix file open dialog for PySide
Merge pull request #550 from ahojnnes/matching-spelling

DOC: Fix spelling in matching example.
Deprecating is_rgb and is_gray
DOCFIX: "\" in `label` docstring now escaped
Merge pull request #563 from JDWarner/docfix_label

Escape `\` in `label` docstring
Add short example for transforms to warp function
Fix parameter description of warp function
Fix parameter descriptions of warp functions
Add examples to doc strings of resize, rotate and rescale functions
Fix spelling error