spark git commit: [MINOR][SPARKR] Add sparkr-vignettes.html to gitignore.

Repository: spark Updated Branches: refs/heads/master 248916f55 -> 7945daed1 [MINOR][SPARKR] Add sparkr-vignettes.html to gitignore. ## What changes were proposed in this pull request? Add ```sparkr-vignettes.html``` to ```.gitignore```. ## How was this patch tested? No need test. Author: Ya

spark git commit: [SPARK-17057][ML] ProbabilisticClassifierModels' thresholds should have at most one 0

Repository: spark Updated Branches: refs/heads/master f3fe55439 -> 248916f55 [SPARK-17057][ML] ProbabilisticClassifierModels' thresholds should have at most one 0 ## What changes were proposed in this pull request? Match ProbabilisticClassifer.thresholds requirements to R randomForest cutoff

spark git commit: [SPARK-10835][ML] Word2Vec should accept non-null string array, in addition to existing null string array

Repository: spark Updated Branches: refs/heads/branch-2.0 9e91a1009 -> ed545763a [SPARK-10835][ML] Word2Vec should accept non-null string array, in addition to existing null string array ## What changes were proposed in this pull request? To match Tokenizer and for compatibility with Word2Ve

spark git commit: [SPARK-10835][ML] Word2Vec should accept non-null string array, in addition to existing null string array

Repository: spark Updated Branches: refs/heads/master 7c382524a -> f3fe55439 [SPARK-10835][ML] Word2Vec should accept non-null string array, in addition to existing null string array ## What changes were proposed in this pull request? To match Tokenizer and for compatibility with Word2Vec, o