PIG-3731: Ability to specify local-mode specific configuration (useful for local/auto-local mode) (aniket486)

git-svn-id: https://svn.apache.org/repos/asf/pig/trunk@1575083 13f79535-47bb-0310-9956-ffa450edef68
PIG-3754: InputSizeReducerEstimator.getTotalInputFileSize reports incorrect size (aniket486)

git-svn-id: https://svn.apache.org/repos/asf/pig/trunk@1575198 13f79535-47bb-0310-9956-ffa450edef68
PIG-3765: Ability to disable Pig commands and operators (prkommireddi)

git-svn-id: https://svn.apache.org/repos/asf/pig/trunk@1575200 13f79535-47bb-0310-9956-ffa450edef68