Massage wording and fix the instructions for run_tests to remove reference to non-existsant -l all option.

Python readme fixes

Fix read through null pointer

Improvements in gRPC C# support for Windows

Updated Python protoc plugin and Python plugin testing.

Grpc ruby switch auth to google auth library ruby

Added support for true synchronous unary call & some performance tests.

Fix shutdown race in CHTTP2

After we have called closed() ensure that no other callbacks are ever made.

Ensure there is no concurrent poller for unary->multipoll

Using HTTP2 compliant cipher suites by default.

Fix mac build

Verifying the peer name on the X509 Certs correctly.

Removing port from checked ssl target name.

- Added a way to override the cipher suites with an environment
  variable so that we can still do interop testing with java7.
- Takes care of #681.

- Should fix #746.

Adding auth test into suite to be run automatically

Temporarly taking out time out as it is not working properly on gcloud command
Restore a flag incorrectly removed earlier

Fixed node cloud-prod commands

Fixed import of google-auth-library

Add HTTP2 header tracing