[maven-release-plugin] prepare release kernel-1.3.1

git-svn-id: https://source.sakaiproject.org/svn/kernel/branches/kernel-1.3.x-release@119628 66ffb92e-73f9-0310-93c1-f5514f145a0a
[maven-release-plugin] prepare for next development iteration

git-svn-id: https://source.sakaiproject.org/svn/kernel/branches/kernel-1.3.x-release@119630 66ffb92e-73f9-0310-93c1-f5514f145a0a