[SPARK-1971] Update MIMA to compare against Spark 1.0.0 #910

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ScrapCodes wants to merge 2 commits intoapache:masterfrom

ScrapCodes:enable-mima/spark-core

Commits on May 30, 2014

Spark core missed out on Mima settings. So in effect we never tested spark core for mima related errors.
ScrapCodes
committed
updated Mima to check against version 1.0
ScrapCodes
committed