[SPARK-8641][SPARK-12455][SQL] Native Spark Window functions - Follow-up (docs & tests)#10402

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hvanhovell:SPARK-8641-docs

Commits on Dec 20, 2015

Commits on Dec 24, 2015

Further Docs for NTile and acknowledging Hive and Presto projects.
hvanhovell
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Commits on Dec 28, 2015

Fix OffsetWindowFunction foldable and nullable. Use raw strings instead of concatenated strings in annotations. Minor doc changes.
hvanhovell
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Fix rank strings.
hvanhovell
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