PIG-3212: Race Conditions in POSort and (Internal)SortedBag during Proactive Spill

git-svn-id: https://svn.apache.org/repos/asf/pig/trunk@1451300 13f79535-47bb-0310-9956-ffa450edef68
PIG-3002: Pig client should handle CountersExceededException (jarcec via billgraham)

git-svn-id: https://svn.apache.org/repos/asf/pig/trunk@1451477 13f79535-47bb-0310-9956-ffa450edef68
PIG-3216: Groovy UDFs documentation has minor typos (herberts via rohini)

git-svn-id: https://svn.apache.org/repos/asf/pig/trunk@1451574 13f79535-47bb-0310-9956-ffa450edef68
Merge branch 'trunk' of https://github.com/apache/pig into trunk