Add alg to compare performance of porter and porter2 stemmers (merged trunk r1457317)

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1457319 13f79535-47bb-0310-9956-ffa450edef68
LUCENE-4839: Fix bug in SorterTemplate.timSort() (merged from r1457315).


git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1457321 13f79535-47bb-0310-9956-ffa450edef68