ENH:  option to add reference channel
STY  _get_eeg_info():  predetermine property list length/use array
FIX: Add failing test
MAINT: osx backend
MAINT: osx backend
revert undesired changes
prune dbg
STY
fix plot raw sizing
Merge pull request #1052 from dengemann/mpl_maint

ENH/FIX/MAINT: add back support for MacOSX backend in mpl
ENH: add field line viz function and method
remove contains experiment
API : refactor the plot_evoked_field function
API : name it make_field_map
add some comments
fix test
fix test
API : refactor plot of field maps (make make_surface_mapping private)
update test_field_interpolation
TST : add test for field viz