add fields in BoltztrapAnalyzer and make BoltztrapRunner handle problems with too loose energy grids. Modify unitests for boltztrap using raw files now.
Merge branch 'master' of github.com:materialsproject/pymatgen

Conflicts:
	pymatgen/electronic_structure/boltztrap.py
	pymatgen/electronic_structure/tests/test_boltztrap.py