SOLR-5302 Analytics component. Checking in to trunk, we'll let it back then port to 4x

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1543651 13f79535-47bb-0310-9956-ffa450edef68
SOLR-5459: Try loading a temporary core when saving a file in the admin UI config editing mode

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1543660 13f79535-47bb-0310-9956-ffa450edef68
Adding debug information to diagnose failure

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1543796 13f79535-47bb-0310-9956-ffa450edef68