added testcases for greycomatrix
for angles pi/4 and 3*pi/4
overrided __eq__ method of region props
removed blankline
added tests, accounted for nan case
added nan case
pep8
reverted irrelevant changes:
reverted irrelevant changes
reverted irrelevant changes
reverted irrelevant changes
Temporarily remove video plugin

The video plugin is broken in its current state. It might come back at a later
time, when the Python bindings to gstreamer are up-to-date again.
removed array cast, added not equals test
Add example of tinting a grayscale image
Update subpackage descriptions
Homogenize subpackage description
Incorporate PR feedback

- Change wording to remove "I"
- Fix typo
- Resize figure for better display
- Create mask using entropy filter to improve colored regions
Fix a couple of grammar typos
Merge pull request #963 from tonysyu/feature/tinting-example

Add example of tinting a grayscale image
Merge pull request #964 from ahojnnes/submods

Update subpackage descriptions
Document removed skimage.io.video in API changes