* Initial implementation of GroupConv+BatchNorm fusion

* Added GroupConv+BatchNorm with Relu fusion

* Added changes to fuse with BoundedRelu

* Changed BoundedRelu to Relu

* Added test; Code cleanup

* Code formatting

* Removed dead code

* Added test cases and other misc

* Bug fix in group conv callback and general cleanup

* Address PR feedback

* Minor edit to comment. MKLDNN divides both input and output channels by groups

* Style fixes and PR feedback