[maven-release-plugin] prepare release entitybroker-1.5.1

git-svn-id: https://source.sakaiproject.org/svn/entitybroker/branches/entitybroker-1.5.x@119636 66ffb92e-73f9-0310-93c1-f5514f145a0a
[maven-release-plugin] prepare for next development iteration

git-svn-id: https://source.sakaiproject.org/svn/entitybroker/branches/entitybroker-1.5.x@119638 66ffb92e-73f9-0310-93c1-f5514f145a0a