add a new method in pdanalyzer useful for finding limiting conditions in chemical potential for multicomponent systems (useful for defect computations)
also fixes some formating in pdanalayzer and add an option to plot chemical potential without referecing to elemental energies
update Vasprun to make sure it can use band structure from HSE computations
adds a MPHSEVaspInputSet and MPBSHSEVaspInputSet to deal with HSE computations. Also adds some unit tests.
Merge branch 'master' of github.com:materialsproject/pymatgen