add functions to MNE matlab toolbox to read epochs from MNE-Python, see https://github.com/mne-tools/mne-matlab/pull/9

git-svn-id: svn+ssh://svn.fcdonders.nl/home/svnroot/fieldtrip/trunk@9190 0cf7c7f0-3615-4144-b4e6-68da3bce3cd0