Added an "explain" method to compatibility. This prints out a message explaining
all the corrections that are applied to an entry.
Merge branch 'master' of github.com:materialsproject/pymatgen
add check in vasprun tests for correct pdos array shape
fixed pdos parsing bug
fix crowd NBO charges parsing bug
Merge remote-tracking branch 'origin/master'
Merge remote-tracking branch 'mpmaster/master'
 Minor changes