Added a POST webscript to apply a rating to a node.
Associated REST test: apply rating as user one, get, apply rating as user two, get.
Deleted the PUT webscript (half-formed anyway)
git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@21086 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261