Add "zenodo" DOI badge.
Change "colour.colorimetry.lightness_1976" definition signature.
Update "colour.colorimetry.lightness" module references.
Update docstrings and inner variable names in "colour.temperature.cct" module.
Update docstrings and inner variable names in "colour.colorimetry.lightness" module.
Update various docstrings in "colour.colorimetry.luminance" module and change "colour.colorimetry.luminance_1976" definition signature.
Update various docstrings in "colour.colorimetry.lightness" module.
Update ".gitignore" file.
Update "Numpy" version in "setup.py" file.
Add disappeared "CIE Illuminant D Series" "D60" chromaticity coordinates for "CIE 1964 10 Degree Standard Observer".

Reference #27.
Remove unneeded commented code.
Add "Sharp" and "CMCCAT2000" chromatic adaptation transforms.

Closes #119.
Update various docstrings.
Merge branch 'feature/v0.3.3' into develop