Merged revision(s) 1444254 from lucene/dev/trunk:
LUCENE-4763: Fix Java version detection in common-build.xml, use correct source version for javadocs, fail build on unsupported java version when documentation linting is enabled

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1444255 13f79535-47bb-0310-9956-ffa450edef68