use knockout-sortable 0.7.2

git-svn-id: https://svn.apache.org/repos/asf/archiva/trunk@1478283 13f79535-47bb-0310-9956-ffa450edef68
use a versionned file name for js library

git-svn-id: https://svn.apache.org/repos/asf/archiva/trunk@1478284 13f79535-47bb-0310-9956-ffa450edef68