simplify code since the rational fraction of both x and 1-x ( x E (0,1) ) will have the same denominator and thus there is no reason to do a lowest common multiple of the two
Minor cleanup.
Merge branch 'mag' of github.com:materialsproject/pymatgen into mag

Conflicts:
	pymatgen/transformations/tests/test_advanced_transformations.py
Merge branch 'master' into mag

Conflicts:
	pymatgen/transformations/advanced_transformations.py