fix comments
Merge branch 'master' of github.com:materialsproject/pymatgen
Decrease tol for chemical potential cutoff checking. Fixes #95.
Also, minor improvements to PDPlotter to allow for use in ipython more easily.
Missing return statement.
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
Remove stray print statements. Add Pourbaix example from Sai.
Add Pourbaix example.
add classmethod adsorb_atom and its unittest
Merge branch 'master' into surface