[SPARK-7482][SparkR] Rename some DataFrame API methods in SparkR to match their counterparts in Scala.#6007

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Commits on May 13, 2015

[SPARK-7482][SparkR] Rename some DataFrame API methods in SparkR to match their counterparts in Scala.
Sun Rui
committed
Rename load()/save() to read.df()/write.df(). Also add loadDF()/saveDF() as aliases.
Sun Rui
committed
Implement alias loadDF() as a new function.
Sun Rui
committed