Add `image_label2rgb`
Fix: Add setup.py which adds data file to the build
ENH: Add some checks on the inputs.
TST: Add tests for image_label2rgb
DOC: Change more examples to use `image_label2rgb`
API Change: `image_label2rgb` changed to `label2rgb`.

The name change reflects a switch in the argument order (and makes the image an optional argument).
fix path import viewers
fix import urllib2 for  python3
workaround for itervalues
fix iteritems for python3 compat
Refactor contribution workflow
Change branch name for consistency across guidelines
Fix typo
Add additional advice about rebasing
Use long parameter version --force rather than -f
FEAT: Generalized n-dimensional array padding
This PR exposes NumPy 1.8+ padding functionality to all
users of scikit-image, regardless of their personal NumPy
version.

The improved (much better scaling with dimensionality)
version introduced in NumPy 1.8 is used.
Change color definitions from ini file to python module

This simplifies the code and allows users to use either `color_dict` or module
variables, e.g., `rgb_colors.white`.
Tweak Sphinx rendering of contribution page
Merge pull request #4 from tonysyu/rebase-workflow-edits

Tweak Sphinx rendering of contribution page
use items/values for python2/3 compat