add DenseVector and SparseVector to mllib, and replace all `Array[Double]` with Vectors#736

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soulmachine wants to merge 6 commits intomesos:masterfrom

soulmachine:master

Commits on Jul 25, 2013

Commits on Jul 26, 2013

replace all Array[Double] with Vector
soulmachine
committed

Commits on Aug 4, 2013

port mahout vector to spark
soulmachine
committed

Commits on Aug 5, 2013

Renamed several functions according to Scala's naming convention
liancheng
committed