* Fix SRL hang when exit.

* Error occurred when enable Async Load in TestDataProvider.
  * It because DataProvider is calling getNextBatchInternal in one thread, and destructing DataProvider in other thread.
  * Add wait routine in DataProvider destructing.
* Also fix another bug, when destructing TestDataProvider and do not read any test data.

Fix #286

* Follow comments, Use mutex is cool!

* Python trainer API and demo

* Adding missing PaddleAPIPrivate.h

* Adding api_train.sh

* More comments

* Bump up patch version to 0b3

* fix error in doc of quick_start
* There are some warning when execute preprocess.sh 

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

* added mnist demo

* modified .gitignore for .project files

* normalize pixel in mnist_provider.py and set use_gpu=0

* Replace DataProviderWrapperConverter with DataProviderConverter in all
demo prediction scripts.

* Minor refinement of swig_py_paddle.rst to keep consistency with the
English version.

* Fix ParameterAttribute for img_conv_layer, tensor_layer, crf_layer, crf_decoding_layer.

Change-Id: Ic24e4bc1f9d5e03bf35058b49a54c78caf7e97a8

Change-Id: If3d82f278560fc0f43e8bebeeef0501a4cf0ea7d

ISSUE=4619881 

git-svn-id: https://svn.baidu.com/idl/trunk/paddle@1502 1ad973e4-5ce8-4261-8a94-b56d1f490c56

ISSUE=4611111

git-svn-id: https://svn.baidu.com/idl/trunk/paddle@1469 1ad973e4-5ce8-4261-8a94-b56d1f490c56

On Ubuntu, /bin/sh is dash. Change to POSIX syntax

ISSUE=4607487

git-svn-id: https://svn.baidu.com/idl/trunk/paddle@1455 1ad973e4-5ce8-4261-8a94-b56d1f490c56

also rename hdfs_data to make it internally.

ISSUE=4604505


git-svn-id: https://svn.baidu.com/idl/trunk/paddle@1451 1ad973e4-5ce8-4261-8a94-b56d1f490c56

ISSUE=4602353

git-svn-id: https://svn.baidu.com/idl/trunk/paddle@1450 1ad973e4-5ce8-4261-8a94-b56d1f490c56

* fix recommendation prediction also.

ISSUE=4561941



git-svn-id: https://svn.baidu.com/idl/trunk/paddle@1449 1ad973e4-5ce8-4261-8a94-b56d1f490c56

ISSUE=4589755

git-svn-id: https://svn.baidu.com/idl/trunk/paddle@1442 1ad973e4-5ce8-4261-8a94-b56d1f490c56

ISSUE=4599577


git-svn-id: https://svn.baidu.com/idl/trunk/paddle@1440 1ad973e4-5ce8-4261-8a94-b56d1f490c56

ISSUE=4597359 

git-svn-id: https://svn.baidu.com/idl/trunk/paddle@1432 1ad973e4-5ce8-4261-8a94-b56d1f490c56

ISSUE=4596311

git-svn-id: https://svn.baidu.com/idl/trunk/paddle@1431 1ad973e4-5ce8-4261-8a94-b56d1f490c56

ISSUE=4575209


git-svn-id: https://svn.baidu.com/idl/trunk/paddle@1430 1ad973e4-5ce8-4261-8a94-b56d1f490c56

But need to check consistency of CPU and GPU later for conv layer.
ISSUE=4592155

git-svn-id: https://svn.baidu.com/idl/trunk/paddle@1427 1ad973e4-5ce8-4261-8a94-b56d1f490c56

ISSUE=4586495

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