SOLR-4370: Allow configuring commitWithin to do hard commits.

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1441483 13f79535-47bb-0310-9956-ffa450edef68
fix bad conflict merge on CHANGES from last commit

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1441520 13f79535-47bb-0310-9956-ffa450edef68
add eol prop

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1441522 13f79535-47bb-0310-9956-ffa450edef68
Merged /lucene/dev/trunk:r1441423-1441567

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/lucene4547@1441570 13f79535-47bb-0310-9956-ffa450edef68