Added setter method setGenerator to JavaRDD.
Added mapPartitions method to JavaRDD.
Added foreachPartition method to JavaRDD.
Remove classtag from mapPartitions.
Remove default param from mapPartitions
Modifications as suggested in PR feedback-

- mapPartitions, foreachPartition moved to JavaRDDLike
- call scala rdd's setGenerator instead of setting directly in JavaRDD
Modifications as suggested in PR feedback-

- more variants of mapPartitions added to JavaRDDLike
- move setGenerator to JavaRDDLike
- clean up
Replace commons-math with jblas
Add jblas dependency
Add jblas dependency
fixed ClassTag in mapPartitions
Merge pull request #499 from jianpingjwang/dev1

Replace commons-math with jblas in SVDPlusPlus
Merge pull request #406 from eklavya/master

Extending Java API coverage

Hi,

I have added three new methods to JavaRDD.

Please review and merge.