refine mkldnn benchmark script

fix atomic issue on ONLYCPU mode

Fix doc of clip op.

Reduce elementwise warning

refine the catalog of FAQ

fix the conflicts of SoftmaxWithCrossEntropyOp with the latest dev branch.

Feature/pybind for protobuf desc

Fix error in unit test of ModifiedHuberLossOp

Use `bool` for PADDLE_ENFORCE, not int

Softmax with cross entropy op.

Make OpRegistery depend on OpInfo

Finish up op creation doc.

* init Infershape

* add static InferShape interface

* refactor add-op infershape

* add AttrReader

* add all maker's infershape

* add all InferShape

* add python infer api

* add VarDesc interface

* add python VarDesc and OpDesc interface

* update python code

* use infershape function to do shape inference

* clean code

* do not use pointer

* refine code of op_proto_maker

* add get_dims to VarDesc

* refine the code

* remove the dependency from operator to op registry

* remove OpProtoAndCheckerMaker from operator

* restore complete_add_op

* add shape_infer_impl.h

* code optimization

* remove const return value

* add fake BlockDesc class

* optimize code

* remove infer function in op_info

* move InferShapeContextImpl to operator.h

* optimize the interface of InferShapeContextBase

* add temperary interface of new infershape

* change add_op, clip_op, conv2d_op and activation_op

* change all operators InferShape

* fix SetDim

* update cos_sim_op

* update crop_op

* update lookup_table_op

* allocate tensor when call GetDim in InferShapeContext

* update modified_huber_loss_op

* update rowwise_add_op

* update mean_op

* update sequence_avg_pool_op

* typo

* remove old InferShape interface

* can compile

* fix or unit test

* clean code

* clean code

* remove const before InferShapeContext

* change InferenceContextBase to pointer

* rename RunTime to Runtime, code clean

* Correcting some grammatical mistakes in the design docs

* Changing image to figure as per code review feedback

* Change pronouns as per code review feedback

* Correcting few more typos

Merge branch 'feature/pybind_for_protobuf_desc' of github.com:reyoung/Paddle into feature/pybind_for_protobuf_desc

Modify multiplex_op

update FAQ.