ENH: clarify docs for apply inverse raw / epochs
ENH: addressing discussion.
Merge pull request #577 from dengemann/inverse_docs

ENH: clarify docs for apply inverse raw / epochs
FIX: Deal with indices more cleanly for numpy 1.8
Merge pull request #579 from Eric89GXL/numpy-fixes

FIX: Deal with indices more cleanly for numpy 1.8