* fix trainer import error on ce

* fix setup.py.in

In this way we can build and test using WITH_FLUID_ONLY flag being set
to ON.

- move paddle.v2.dataset,reader to paddle.dataset,reader
- remove unused code (which depends on v2) in paddle.dataset,reader

* Make cast op support bool

Also add `elemwise_sub/mul/abs/clip` layers

* Make fuild.layers as a module

* Move layers as a module

* Split layers.py into layers module

* Fix CI

* Fix CI

* write versino.py

* add version py

* clean init py

* add istaged, major and etc... fields

* update

* update

* update

* init commit

* change some dir name

Fix invalid paddle executable file path with pip install  

2. fix path of bin files

* put everything in paddle wheel

* update

* update

* fix unitest

* with platform specs

* because it uses `numpy.flip` in `test_image.py`

* PyBind and SWIG of paddle cannot be load in a single Python process,
  lazy import all SWIG library of Paddle. Otherwise, the glog, gflags
  are imported twice in a same Python process.
* Note that all PyBind11 return C++ std::string as an unicode. For
  protobuf, it is need be cast to `str` before use them.
* Add unit test for Get `OpProtos`