FIX: backporting matrix_rank

this fixes recent build issues across numpy versions related
to the new anova function.
COSMIT + proper conditional backporting
Merge pull request #600 from dengemann/fix_test_parametric

FIX: backporting matrix_rank
FIX: drop testing support for pandas < 0.8
Merge pull request #601 from dengemann/fix_pandas_index

FIX: drop testing support for pandas < 0.8
Update epochs.py

cc @agramfort | @Eric89GXL this fixes a stupid bug that broke at least one example.
ENH: new stc cluster summary function

ENH: add summarize_clusters_stc function

ENH: fixes + address discussion

FIX: fix tests
Merge pull request #607 from dengemann/stc_summarize_clusters

ENH: stc summarize clusters
WIP/ENH: allow for return_generator argument with lcmv epochs

ENH: refactor lcmv generator + add test

UPDATE what's new

COSMITS
ENH: address discussion
ENH: address discussion
Merge pull request #602 from dengemann/lcmv_return_generator

ENH: allow for return_generator argument with lcmv epochs
WIP: add draft of gamma map implementation
wip gamma_map
gamma map method
gamma map cleanup
cleanup, moved mixed_norm
deprecated mixed_norm module
cleanup, renamed
update what's new