first pass change for k8s aws en tutorial

Fix bug in DenseScanner of DataProviderConverter.

add missing dependency of zlib to protobuf

Make sign compare as a compile warning not error.

Enable cuda dynamic link libs

Without the permission command `aws kms --region=us-west-1 create-key --description="kube-aws assets"` will fail with:
An error occurred (AccessDeniedException) when calling the CreateKey operation:

add usage collection for demo

Add ParameterServerController for parameter server python api

Update build and install docs

Fix cudart bugs before initMain

fix some warning about CpuSparseMatrix

Add some explanation for 'your_repo' 

Upgrade python protobuf to 3.0.0

Make gflags third_party path configurable

fix unit test of paramRelu

Feature/travis ci cache third party

Add BufferArg as the Function argument type and modify the Function prototype to remove the inouts argument.

Add some functions to PaddleAPI.h