Update install doc (#945)

* test=develop, update install doc

* add setuptools dependency

* Update compile_Ubuntu.md

update cudnn version

* Update install_Ubuntu.md

update cudnn version

* Update install_CentOS.md

update cudnn version

* test=develop, refine ubuntu cuda support

* test=develop, refine ubuntu cuda support

* test=develop, refine python support on python3.5

* fix python2 in ubuntu16.04 need gcc 5.4

* add nccl related doc

* refine doc

* add gpu fast install doc

* refine command of pip

* add avx off for mac complie

doc/fluid/beginners_guide/install/compile/compile_MacOS.md

@@ -82,7 +82,7 @@
 
 	*  对于需要编译**CPU版本PaddlePaddle**的用户：
 
-		`cmake .. -DPY_VERSION=3.5 -DWITH_FLUID_ONLY=ON -DWITH_GPU=OFF -DWITH_TESTING=OFF  -DCMAKE_BUILD_TYPE=Release`
+		`cmake .. -DPY_VERSION=3.5 -DWITH_FLUID_ONLY=ON -DWITH_GPU=OFF -DWITH_TESTING=OFF -DWITH_AVX=OFF -DCMAKE_BUILD_TYPE=Release`
 
 		> 我们目前不支持MacOS下GPU版本PaddlePaddle的编译