[SPARK-9613] [CORE] Ban use of JavaConversions and migrate all existing uses to JavaConverters#8033

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srowen wants to merge 1 commit intoapache:masterfrom srowen:SPARK-9613

+863-880

Commits on Aug 25, 2015

Replace JavaConversions implicits with JavaConverters and add scalastyle check
srowen
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