PIG-3136: Introduce a syntax making declared aliases optional (jcoveney via cheolsoo)


git-svn-id: https://svn.apache.org/repos/asf/pig/trunk@1452909 13f79535-47bb-0310-9956-ffa450edef68
PIG-3211: Allow default Load/Store funcs to be configurable (prkommireddi via cheolsoo)


git-svn-id: https://svn.apache.org/repos/asf/pig/trunk@1452913 13f79535-47bb-0310-9956-ffa450edef68
PIG-3241: ConcurrentModificationException in POPartialAgg 

git-svn-id: https://svn.apache.org/repos/asf/pig/trunk@1455767 13f79535-47bb-0310-9956-ffa450edef68
Merge branch 'trunk' of git://git.apache.org/pig into trunk