fix paddle docker hub path (paddledev/paddle not paddle-dev/paddle)

Remove compile warning on AppleClang 8.0 in BufferArg.h

* CHECK_XX in glog need the left and right values are both signed or
  unsigned integer. So we could use integer literal syntax in C/C++
  to make literal unsigned or signed. Add suffix 'UL' means unsigned
  long.

route53 config with screenshots added

change the parameter position of gru_step_layer from 1 back to 0

* 'develop' of https://github.com/PaddlePaddle/Paddle:
  switch the parameter index in GruStepLayer in test_LayerGrad
  make gru_group parameters sharable

make gru_group parameters sharable

updated comments for gru_group and lstm_group in networks.py

Paddle standard development environment as a Docker image

Matrix::MUL operators using and test Daoyuan's Paddle Function, SparseMatrixArg and Function Test

Remove unused init method in paddle::Trainer

V2 optimizer

Removed unused GradientMachine::create

change english documentation for parameter ports_num and ports_num_fo…

remove `allow_inefficient_sparse_update` since it's only defined but …

Function Adds some properties

added region check step, route53 config.

fix docker build

I am getting following error without this commit when doing docker build.

  File "<string>", line 1, in <module>
  File "/usr/local/lib/python2.7/dist-packages/setuptools/__init__.py", line 12, in <module>
    import setuptools.version
  File "/usr/local/lib/python2.7/dist-packages/setuptools/version.py", line 1, in <module>
    import pkg_resources
  File "/usr/local/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 70, in <module>
    import packaging.version
ImportError: No module named packaging.version

No idea why this change fix the problem, but it does fix.