fix comments
Merge branch 'master' of github.com:materialsproject/pymatgen
fix an issue with getmu_vertices_stability_phase removing duplicate vertices and fix the unittest that was depending on the order of the elements in the list
Merge branch 'master' of github.com:materialsproject/pymatgen

Conflicts:
	pymatgen/phasediagram/pdanalyzer.py
	pymatgen/phasediagram/tests/test_pdanalyzer.py