Optimization changes for merge Sort
Merge remote-tracking branch 'upstream/develop' into StableSortOptimization
Merge sort optimization for StableSort and StableSortByKey
Added support for size in getBuffer() function
Added Some test cases for float,double and UDD + some doc changes
Corrected some test cases + changed kernel name
Merge pull request #138 from avinashcpandey/StableSortOptimization

Stable sort optimization