ENH: pickle support for Label objects
ENH : adding example using single trial megsim data
FIX: Fix vertex_to_mni calculation
Merge pull request #522 from agramfort/meg_single_trial_example

ENH : adding example using single trial megsim data
Merge pull request #517 from christianmbrodbeck/pickle

ENH: pickle support for Label objects
FIX: Test only if Freesurfer installed
Merge pull request #524 from Eric89GXL/v2m-fix

FIX: Fix vertex_to_mni calculation
ENH: Allow use of nibabel
ENH: Better options
Merge pull request #526 from Eric89GXL/nibabel-xfm

ENH: Allow use of nibabel
ENH: Better vertex_to_mni test
ENH: Use BallTree nearest neighbor search
cleanup
Merge pull request #528 from mluessi/compute_nearest_balltree

ENH: Use BallTree nearest neighbor search
FIX: Fixing transform for vertex_to_mni
Working version which also accepts two channels as input. diffs should
show ALL differences that have resulted while adding new option.
FIX: Counter imported from collections not from fixes

Closes #532.
Merge pull request #533 from dengemann/fix_counter

FIX: Counter imported from collections not from fixes
Misc changes. Fixed docstrings and KISS for multiple channels
update mpl req