Allow user to remove broadcast variables when they are no longer used#771

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RongGu wants to merge 2 commits intomesos:masterfrom RongGu:master

+110-26

Commits on Aug 2, 2013

In Spark, users can create broadcast variables to share read-only variables across tasks or operations,especially when they are large. However, the current Spark does not allow user to remove those…
RongGu
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Commits on Aug 3, 2013

1.Change the names of remove broadcast method and its parameters.
RongGu
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