OOZIE-1458 If a Credentials type is not defined, Oozie should say something (rkanter)

git-svn-id: https://svn.apache.org/repos/asf/oozie/trunk@1511509 13f79535-47bb-0310-9956-ffa450edef68
OOZIE-1449 Coordinator Workflow parent relationship is broken for purge service (rkanter)

git-svn-id: https://svn.apache.org/repos/asf/oozie/trunk@1511513 13f79535-47bb-0310-9956-ffa450edef68
OOZIE-1403 forkjoin validation blocks some valid cases involving decision nodes (rkanter)

git-svn-id: https://svn.apache.org/repos/asf/oozie/trunk@1511514 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/trunk' into trunk
Merge remote branch 'origin/trunk' into trunk-gd
Merge remote branch 'origin/trunk-gd' into fb-YAHOO-308-trunk-gd