[SPARK-2315] Implement drop, dropRight and dropWhile for RDDs, which#1839

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erikerlandson:rdd_drop_master

Commits on Aug 11, 2014

[SPARK-2315] Implement drop, dropRight and dropWhile for RDDs, which
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[SPARK-2315] replace 'parent' with 'input' in case rdd.parent[T](j) gets accepted
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[SPARK-2315] ensure that functions are cleaned
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