LUCENE-5213: Use <groovy/> instead <script/> ant task


git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1523214 13f79535-47bb-0310-9956-ffa450edef68
LUCENE-4906: make expert Object method protected

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1523225 13f79535-47bb-0310-9956-ffa450edef68
LUCENE-5209: Allow the license checker to optionally avoid check sum comparisons on SNAPSHOT dependencies.

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1523356 13f79535-47bb-0310-9956-ffa450edef68
improve license version detection

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1523367 13f79535-47bb-0310-9956-ffa450edef68