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).
add optional + default in pyx docstring
Merge pull request #572 from sciunto/docandco

add optional + default in pyx docstring
Remove reference to Bento hookfile.
Modified 'denoise_bilateral':\n1) check that image max value is not zero to avoid segmentation fault.\n2) initialize color_lut after sigma_range has been checked.
Deported variable initialization after the cdef block to allow verifications.
Reduce code duplication in test_radon_transform

Although the line count is increased by these changes, future tests can
be written in fewer lines.
PEP8 fixes for test_radon_transform
Merge pull request #578 from josteinbf/radon-test-refactor

Reduce code duplication in tests for transform.radon_transform
Moved image conversion after the verification of the max_value
Merge pull request #576 from alexis-mignon/master

Bugs in filter.denoise_biltateral.
Added a function for Gamma Correction
Prevented info loss, implemented Log and Sigmoid Correction
Separating the functions
Separating correction methods into different functions