* Add channel design document

* Update channel send/recv state diagram

added missing *.pb.h *.pb.cc generation to fix distribute build issue

remove vars when remove ops

In place batch_norm

fix submit_local's paddle pip name issue

Fix slr deser

This reverts commit d4f49355.

translate Cluster Training and Prediction

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