[SPARK-18073][DOCS][WIP] Migrate wiki to spark.apache.org web site#15967

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srowen wants to merge 2 commits intoapache:masterfrom

srowen:SPARK-18073.1

Commits on Nov 21, 2016

Update links from wiki to new location on site as part of migration
srowen
committed

Commits on Nov 22, 2016

Point remaining wiki links to spark.apache.org
srowen
committed