RSTR-71 update license, dependencies, prune redundant pom elements

git-svn-id: https://source.sakaiproject.org/contrib/roster2/trunk@85608 fdecad78-55fc-0310-b1b2-d7d25cf747c9
RSTR-71 back down yui-compressor version to 1.3.3, 1.4.0 requires Maven 3.0.4 to build and Jenkins is only set up for 3.0.3.

git-svn-id: https://source.sakaiproject.org/contrib/roster2/trunk@85609 fdecad78-55fc-0310-b1b2-d7d25cf747c9
RSTR-71 back down yui-compressor version to 1.2 requires Maven 3.0.4 to build and Jenkins is only set up for 3.0.3.

git-svn-id: https://source.sakaiproject.org/contrib/roster2/trunk@85610 fdecad78-55fc-0310-b1b2-d7d25cf747c9