Merge pull request #59 from gmatteo/master

Support for PAW setups in XML format
Fix SO2 and SO3 energy corrections to per atom instead of per formula unit
Merge branch 'master' of github.com:materialsproject/pymatgen
fix SO2 and SO3 energies once again.
 Always convert rotations.dtype to Python int compatible before calling spg.pointgroup(rotations)
Merge remote-tracking branch 'mpmaster/master'