[SPARK-1331] Added graceful shutdown to Spark Streaming#247

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tdas wants to merge 7 commits intoapache:masterfrom

tdas:graceful-shutdown

Commits on Mar 27, 2014

Added graceful shutdown to Spark Streaming.
tdas
committed

Commits on Apr 4, 2014

Commits on Apr 7, 2014

Reduced time taken by graceful shutdown unit test.
tdas
committed

Commits on Apr 8, 2014