Update various docstrings.
Fix incorrect docstrings referencing "dict" instead of "CaseInsensitiveMapping".
Add contributor.
Merge pull request #124 from colour-science/feature/chromatic_adaptation

PR: Implement "colour.chromatic_adaptation" convenient definition that transforms "CIE XYZ" tristimulus values from one viewing condition to another.
Update various docstrings.
Fix incorrect docstrings referencing "dict" instead of "CaseInsensitiveMapping".
Add contributor.
Merge branch 'feature/v0.3.3' of https://github.com/colour-science/colour into feature/v0.3.3
Fix default arguments formatting inconsistency in docstrings.
Implement support for "CMCCAT2000" chromatic adaptation model.

References #120.
Add "optional" descriptor to parameters docstrings.
Merge branch 'feature/CMCCAT2000' of https://github.com/colour-science/colour into feature/CMCCAT2000