contribution from Ricky Sachdeva for single trial STC files

[system]

hi mne-users,

to let you know I've just add to mne-matlab a script from Ricky
Sachdeva to get single trial stc files:

https://github.com/mne-tools/mne-matlab/commit/dd3b5b09e162a290f7092642ac9bf28816b0ad1d

https://github.com/mne-tools/mne-matlab/blob/master/matlab/mne_ex_compute_inverse_single_trial.m

hope this can help people on the mailing list.

thanks for contributing.

Alex