ACCUMULO-1354 apply pom simplification to 1.5 branch and update related documentation

git-svn-id: https://svn.apache.org/repos/asf/accumulo/branches/1.5@1484294 13f79535-47bb-0310-9956-ffa450edef68
ACCUMULO-1354 merge doc updates to trunk

git-svn-id: https://svn.apache.org/repos/asf/accumulo/trunk@1484297 13f79535-47bb-0310-9956-ffa450edef68