improve debug info for client and server iomgr object leaks

prevent TestResults.xml collision of parallel test runs on windows

Be less verbose during shutdown

Cython refactor of Python C wrapping layer

Fix host name matching not working

Handle settings frame making a stream writable

Add parallel execution for generate_projects

Bumped Ruby package version to 0.10.0

Expose AuthContext in ClientContext and ServerContext

For Docker grpc_java, no longer build Netty

Conditionally runs the tests depending on the availability of Python
versions (because Travis is the worst).

Update dockerfile of gRpc Android interop test to use the code inside grpc-java repository.

Split mu_call into a server-wide and a per-call lock

Adding support for raw access token credentials.

Support registering services against specific hosts

Add metadata refcount debug helpers

Creating a branch during the Jenkins build to silence a warning.

Adds an interop test: oauth2_auth_token

Adding MacOS support in our run_jenkins script.

Adding JWT verifier.

Don't use pkg-config to look for perftools

In grpc/grpc-java#425 we will be removing the netty submodule.

Fix a few issues with pkg-config file generation

Fixing variable names discrepancy in ruby's extension builder.