PIG-3777: Pig 12.0 Documentation

git-svn-id: https://svn.apache.org/repos/asf/pig/branches/branch-0.12@1571758 13f79535-47bb-0310-9956-ffa450edef68
PIG-3494: Several fixes for e2e tests - fix piggybank location in local mode (rohini)

git-svn-id: https://svn.apache.org/repos/asf/pig/branches/branch-0.12@1571863 13f79535-47bb-0310-9956-ffa450edef68