Added CAC Login, SolrCloud AutoDetection

Added ability to login via CAC.  

Added auto detection traditional Solr and SolrCloud.  If on SolrCloud Cases use collection and alias names.  if on traditional Solr it uses core names.  

Added a copy of custom.tld to WEB-INF.  Tomcat6 looks in the tags subdirectory, Tomcat7 does not.