Refactorize framework/*.proto

Merge branch 'refactorize_framework_proto' of https://github.com/wangkuiyi/Paddle into refactorize_framework_proto

Polish Our code by YuYang's review

enable self-defined index data in testLayerGrad.

Fix macro !defined(PADDLE_ONLY_CPU)

Rnn forward result test

Fix docker dev startup bug

Update Develop Branch And Fix All unit tests.

* remove SliceCopied

* remove SliceCopied

* rename SliceShared to SliceLevels, SliceInLevel

* merge lod_tensor/details

* remove lod_start_pos_'s shared_ptr

* make lod-tensor a special tensor

* add clone to lod_tensor

* add lod tensor impl

* add lodtensor clone test

* init lod

* add equal

* merge LOD and its methods

* recover tensor and variable

* change thrust to host_vector

auto update the requirements in .travis.yml with python/setup.py.in

fix cpplint error

add auto gradient check design doc

remove eigen tensor header file in ddim.h

Refactorize grad op builder.cc

Correct the use of protobuf generated methods

Merge branch 'develop' of https://github.com/paddlepaddle/paddle into refactorize_grad_op_builder.cc

Add constructors to OperatorBase and all sub-classes