Fix typo of Softmax document

Improvements for MKLDNN LRN

This is a temporary solution to allowing for variables to be copied during a channel send operations.  Also fixed issue with is_copy for "channel_send" method, and also updated unit tests.

* Fluid Channel should match Go Channel in Semantics

* Fix Python channel_send

* Address code rveiew feedback

* Fix open_files_op.cc

* Add description to Channel Asserts

* Create go_op design doc

* Update index_en.rst

New file

* Update index_en.rst

Fix refer to suggestions

* add split_ids_op

* add TestSplitIdsOp

* fix comment

* add test for empty tensor

* clean code

* rm unused code

Add pinned memory

 add MKL for fluid static and shared library

Fix test_recv_op

* add LRN layer for fluid

* add LRN layer for fluid

* add documentation for LRN layer

* add paper reference for LRN layer

* add seperate documentation for LRN layer

* rm lrn.py in doc/fluid/dev/src

* change code style in lrn

* fix style of comments in lrn

Improve layer_norm speed

Split send op to send_vars and send_barrier

MKLDNN Relu Tanh Sqrt Abs activations added

* support empty tensor

Fix links in the English Documents

Fix concat_op

"fast hack"

    transfomer on a single device step time
    reduces from 0.157 to 0.125