bugfix - merged pull request 31 from Gio, see https://github.com/fieldtrip/fieldtrip/pull/31. Use xml.epochs instead of xml.epoch, also deal with xml.epoch if present. 


git-svn-id: svn+ssh://svn.fcdonders.nl/home/svnroot/fieldtrip/trunk@9519 0cf7c7f0-3615-4144-b4e6-68da3bce3cd0