[SPARK-3936] Add aggregateMessages, which supersedes mapReduceTriplets#3100

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ankurdave wants to merge 7 commits intoapache:masterfrom

ankurdave:aggregateMessages

Commits on Nov 1, 2014

Optimizations for mapReduceTriplets and EdgePartition
ankurdave
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Commits on Nov 5, 2014

Add aggregateMessages, which supersedes mapReduceTriplets
ankurdave
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Commits on Nov 12, 2014

Address @rxin comments on apache/spark#3054 and apache/spark#3100
ankurdave
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