SPARK-1242 Add aggregate to python rdd#139

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holdenk wants to merge 4 commits intoapache:masterfrom

holdenk:add_aggregate_to_python_api

Commits on Mar 14, 2014

Commits on Apr 8, 2014

CR feedback, fix issue with empty RDDs in aggregate
holdenk
committed

Commits on Apr 22, 2014

Merge in master
holdenk
committed