Merge pull request #176 from avinashcpandey/develop

Added some fixes in AMP device_vector + changed size_t with unsigned int...
Added the .h and .inl for scatter and gather routines in include/bolt/btbb/detail/inner_product.inl And Benchmark code changes
Merge pull request #177 from rkskvk/develop

Added the .h and .inl for scatter and gather routines in include/bolt/bt...
Merge pull request #178 from avinashcpandey/develop

AMP reduce_by_key optimization changes