Remove git submodule from docs

Author: gangliao

doc/faq/index_cn.rst

@@ -286,22 +286,3 @@ PaddlePaddle的参数使用名字 :code:`name` 作为参数的ID，相同名字
 ..      code-block:: bash
 
         paddle train --use_gpu=true --trainer_count=2 --gpu_id=2
-
-12. 编译源码提示warp-ctc/include/ctc.h 找不到的情况
----------------------------------------------------
-
-目前Paddle使用\ :code:`git submodule`\ 来引用一些第三方模块。简单的\
-:code:`git clone`\ 命令不能得到第三方模块的代码。需要使用\:
-
-..  code-block:: bash
-
-    git clone --recursive https://github.com/PaddlePaddle/Paddle.git
-
-来获取所有源码。对于已经clone的git版本库，可以在Paddle的源码目录中执行\:
-
-..  code-block:: bash
-
-    git submodule init
-    git submodule update
-
-来获得所有第三方模块。

doc/getstarted/build_and_install/build_from_source_en.md

@@ -17,7 +17,7 @@ cd paddle
 To compile the source code, your computer must be equipped with the following dependencies.
 
 - **Compiler**: GCC >= 4.8 or Clang >= 3.3 (AppleClang >= 5.1)
-- **CMake**: version >= 3.0
+- **CMake**: version >= 3.0 (at least CMake 3.4 on Mac OS X)
 - **BLAS**: MKL, OpenBlas or ATLAS
 
 **Note:** For CUDA 7.0 and CUDA 7.5, GCC 5.0 and up are not supported!
@@ -64,10 +64,13 @@ As a simple example, consider the following:
 
 1. **BLAS Dependencies(optional)**
 
-    Paddle will find BLAS from system's default path. But you can specify MKL, OpenBLAS or ATLAS via `CBLAS_INC_DIR` and `CBLAS_LIBRARIES`.
+    Paddle will find BLAS from system's default path. But you can specify MKL, OpenBLAS or ATLAS via `MKL_ROOT`, `OPENBLAS_ROOT` or `ATLAS_ROOT`.
 
     ```bash
-    cmake .. -DCBLAS_INC_DIR=<cblas_inc> -DCBLAS_LIBRARIES=<cblas_libs>
+    # specify MKL
+    cmake .. -DMKL_ROOT=<mkl_path>
+    # or specify OpenBLAS
+    cmake .. -DOPENBLAS_ROOT=<openblas_path>
     ```
 
 2. **Doc Dependencies(optional)**

doc/getstarted/build_and_install/docker_install_en.rst

@@ -16,23 +16,13 @@ Developers can work on PaddlePaddle using Docker.  This allows
 developers to work on different platforms -- Linux, Mac OS X, and
 Windows -- in a consistent way.
 
-The general development workflow with Docker and Bazel is as follows:
+The general development workflow with Docker and CMake is as follows:
 
 1. Get the source code of Paddle:
 
    .. code-block:: bash
 
-      git clone --recursive https://github.com/PaddlePaddle/Paddle.git
-
-   
-   Here **git clone --recursive is required** as we have a submodule `warp-ctc <https://github.com/baidu-research/warp-ctc>`_.
-
-   If you have used :code:`git clone https://github.com/PaddlePaddle/Paddle` and find that the directory :code:`warp-ctc` is
-   empty, please use the following command to get the submodule.
-
-   .. code-block:: bash
-
-      git submodule update --init --recursive
+      git clone https://github.com/PaddlePaddle/Paddle.git
 
 
 2. Build a development Docker image :code:`paddle:dev` from the source
@@ -162,7 +152,6 @@ source code:
    cd ~
    git clone https://github.com/PaddlePaddle/Paddle.git
    cd Paddle
-   git submodule update --init --recursive
    docker build --build-arg WITH_AVX=OFF -t paddle:cpu-noavx -f paddle/scripts/docker/Dockerfile .
    docker build --build-arg WITH_AVX=OFF -t paddle:gpu-noavx -f paddle/scripts/docker/Dockerfile.gpu .
 

doc/howto/dev/contribute_to_paddle_cn.md

@@ -33,7 +33,6 @@ cd Paddle
 git checkout -b develop  # 创建 develop 分支
 git remote add upstream https://github.com/PaddlePaddle/Paddle.git  # 添加 upstream 到 baidu/Paddle
 git pull upstream develop  # 更新 upstream
-git submodule update --init --recursive
 ```
 
 然后你可以通过做一个本地开发分支开始开发

doc/howto/dev/contribute_to_paddle_en.md

@@ -38,7 +38,6 @@ cd Paddle
 git checkout -b develop  # create develop branch.
 git remote add upstream https://github.com/PaddlePaddle/Paddle.git  # add upstream to baidu/Paddle
 git pull upstream develop  # update to upstream
-git submodule update --init --recursive
 ```
 
 Then you can start to develop by making a local developement branch