SOLR-1301: ignore '*.iml' in new Solr contribs' directories; put new Solr contribs' lib/ and test-lib/ directories under Subversion control; ignore '*.jar' in these directories

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1548319 13f79535-47bb-0310-9956-ffa450edef68
SOLR-5539: Admin UI - Remove ability to create/modify files

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1548477 13f79535-47bb-0310-9956-ffa450edef68
SOLR-5525

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1548503 13f79535-47bb-0310-9956-ffa450edef68