[SPARK-5201][CORE] deal with int overflow in the ParallelCollectionRDD.slice method#4002

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advancedxy:SPARk-5201

Commits on Jan 12, 2015

Deal with inclusive and exclusive ranges in one case. If the range is inclusive
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Add test cases for ranges end with Int.MaxValue or Int.MinValue
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rename sign to needsInclusiveRange. add some comments
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Commits on Jan 13, 2015

Convert the two cases pattern matching to one case.
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Commits on Jan 14, 2015