[SPARK-16063][SQL] Add storageLevel to Dataset#13780

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MLnick wants to merge 7 commits intoapache:masterfrom

MLnick:ds-storagelevel

Commits on Jun 17, 2016

wip
Nick Pentreath
committed

Commits on Jun 20, 2016

Clean up and tests
Nick Pentreath
committed
back out intellij auto-format changes
Nick Pentreath
committed
getStorageLevel -> storageLevel
Nick Pentreath
committed

Commits on Jun 21, 2016

Add storageLevel to PySpark DataFrame, and fix default storage levels
Nick Pentreath
committed
make storageLevel a property
Nick Pentreath
committed
remvoe parens from storageLevel def
Nick Pentreath
committed