ENH ClusterDist:  slices of TFCE results
DOC testnd:  better error message for invalid kwargs
ENH SourceSpace:  allow .index_for_label() with string
FIX plot.topo:  vmax & vmin kwargs
FIX plot.topo:  **layout kwargs
ENH SelectEpochs GUI:  GA button to plot Grand Average
FIX SelectEpochs:  key-press over no axes
WIP SETUP:  use setuptools upload_docs
ENH t_contrast:  allow cells with "*"
ENH MneExperiment:  dynamic “{sns-kind}”
ENH MneExperiment:  evoked-kind
ENH Dataset.aggregate():  ADD equal_count argument
ENH MneExperiment:  ADD option to equalize trial count in evoked files
DOC:  changes
FIX MneExperiment.load_events():  `edf` kwarg
API Factor:  cells in tuple instead of list, LazyProperty