bump snapshot version to 3.7.0 for RC
bump snapshot version to 3.7.0 for RC

andreasnef/fcrepo,fcrepo3/fcrepo,fcrepo3/fcrepo,andreasnef/fcrepo,fcrepo3/fcrepo,andreasnef/fcrepo,fcrepo3/fcrepo,andreasnef/fcrepo