Removed <thread> header in TBB scan,reduce and scan_by_key inl files
Merge pull request #157 from shruti-ramesh/new-changes

Removed <thread> header in TBB scan,reduce and scan_by_key inl files
Merge pull request #158 from avinashcpandey/develop

Fixed some issues with merge sortbykey + corrected many test cases + add...
Fixed reduce by key for amp size limit
Merge remote-tracking branch 'upstream/develop' into develop