Merge pull request #510 from dengemann/fix_epo_baseline_arg

FIX?  -- reading epochs that aren't baselined
FIX : fix lcmv pinv cond
FIX: is_surface() for volume source spaces
ENH: More tests
STY: Cleanup
ENH: Combining tests
ENH: -vol.w support
ENH: More complete test
Merge pull request #511 from Eric89GXL/vol-fix

FIX: is_surface() for volume source spaces
ENH+FIX: Read extra meas info, fix raw concat error
FIX: Minor test fix
ENH: Allowing overwriting of raw files
ENH: Adding viz.compare_fiff()
STY: Cleaner
typo
fix manifest
FIX: Allow bads exclusion at proj stage
STY: Better description
STY: Typo
FIX: Adding test