restructuring - made m-file wrappers for mxSerialize and mxDeserialize to deal with changes in matlab 2014a, see http://bugzilla.fcdonders.nl/show_bug.cgi?id=2452. Renamed the original mex file to mxSerialize_c/mxDeserialize_c. The wrapper now selects the c or the cpp version, depending on the matlab version.

git-svn-id: svn+ssh://svn.fcdonders.nl/home/svnroot/fieldtrip/trunk@9275 0cf7c7f0-3615-4144-b4e6-68da3bce3cd0