Merge pull request #540 from dengemann/ica_epochs

WIP/API/ENH: create epochs in ICA space
fix doctest
Merge pull request #549 from dengemann/ica_epochs

FIX: set ica_epochs to preload
fix: use label in example
Merge pull request #550 from mluessi/fix_ex_label

fix: use label in example
fix n_times_in
Merge pull request #552 from mluessi/fix_n_times_in

FIX: n_times_in
API/WIP: move to io module
CLEANUP: io.__init__.py
ENH: remove kviterator names from fiff name space