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

git-svn-id: https://source.sakaiproject.org/svn/polls/branches/polls-1.5.x@119666 66ffb92e-73f9-0310-93c1-f5514f145a0a
[maven-release-plugin] prepare for next development iteration

git-svn-id: https://source.sakaiproject.org/svn/polls/branches/polls-1.5.x@119668 66ffb92e-73f9-0310-93c1-f5514f145a0a
Reverting pom back to SNAPSHOT

git-svn-id: https://source.sakaiproject.org/svn/polls/branches/polls-1.5.x@119712 66ffb92e-73f9-0310-93c1-f5514f145a0a