* Python trainer API and demo

* Adding missing PaddleAPIPrivate.h

* Adding api_train.sh

* More comments

* Bump up patch version to 0b3

* Fix bug in yield dictionary in DataProvider.
* Also make virtualenv work in Paddle.

* save the model file including git sha1

* Add automatic check AVX in CMake
* Revise table format and some words in build docs

* min_pool_size would be infinite by default.
  * add unittest for min_pool_size
* Fix bug in can_over_batch_size
  * add unittest for can_over_batch_size
* Add DEFINE_PROVIDER_EX
* Add default value of should_shuffle
  * When training, the default value of should_shuffle is True.
  * When testing, the default value of should_shuffle is False.
  * User a set a provider should_shuffle or not by pass it to `@provider`
  * should_shuffle can handle a list of value, not just boolean
* Add input order mapping by using name
  * Add unittest
* Add check to check input format.
  * Default is close for speed reason.
  * User could stop train when check error, or continue train without
    this train sample.
* use deque instead of vector in generators pool, make erase
  generator faster.
* Add chinese/english documentation
* Make should shuffle = false in unittest
* Add python files to depends.

* Also fix a bug, we should link -ldl at last

* Also make use cmake find to zlib.
* circle link in osx, use reverse link all libs instead. But
  maybe osx just don't care circle link.

Change-Id: I0b8608feab8f6be5094e8981fc5f65cb401ed415

ISSUE=4587205

git-svn-id: https://svn.baidu.com/idl/trunk/paddle@1414 1ad973e4-5ce8-4261-8a94-b56d1f490c56

ISSUE=4587443


git-svn-id: https://svn.baidu.com/idl/trunk/paddle@1412 1ad973e4-5ce8-4261-8a94-b56d1f490c56

ISSUE=4586495

git-svn-id: https://svn.baidu.com/idl/trunk/paddle@1408 1ad973e4-5ce8-4261-8a94-b56d1f490c56