Add support for len(param.offset)==1


Removed axis from crop op args

1. Auto transformation between data format, data type and memory type.
2. Add device placement optimization strategy.

1. input_data_formats flag in yaml supports OIHW
2. MaceTensor support OIHW data format

1. Fix data format bug at buffer_transformer.
2. Fix duplicate tensor name bug caused by inplace caffe op.

1. Merge the Operation and OpKernel into Operation.
2. Add OpDefRegistry for registering the definitions of Operations.
3. Add information for MaceStatus.
4. Unify 'BatchNorm' and 'FoldedBatchNorm' into 'BatchNorm'
5. Remove unused op 'Proposal'