SOLR-4221 SOLR-4808 SOLR-5006 SOLR-5017 SOLR-4222

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1508968 13f79535-47bb-0310-9956-ffa450edef68
Merge branch 'trunk' of http://git.apache.org/lucene-solr into lucene-4818
LUCENE-4818 - added classifier performance tests