better to use a select2 binding

git-svn-id: https://svn.apache.org/repos/asf/archiva/trunk@1452603 13f79535-47bb-0310-9956-ffa450edef68
better to use a select2 binding: add it

git-svn-id: https://svn.apache.org/repos/asf/archiva/trunk@1452604 13f79535-47bb-0310-9956-ffa450edef68