Code formatting.
Implement "IES TM-27-14" skeleton.

References #152.
Fix broken unit tests in "IES TM-27-14" skeleton.
Implement support for "IES TM-27-14 - IES Standard Format for the Electronic Transfer of Spectral Data" paper.

Closes #152.
Fix "Python 2.6" related whitespace issue in "colour.io.ies_tm2714.IES_TM2714_Spd" class.
Update various docstrings.
Merge pull request #156 from colour-science/feature/IES_TM2714

PR: Implement support for "IES TM-27-14 - IES Standard Format for the Electronic Transfer of Spectral Data" paper.