Node differentiate between binary and string headers

Fixes for Windows atomics.

Adds a dockerfile and script for building a tar archive containing protoc and the plugins

- the name includes a version
- the top-level directory of the tar has the same name as the archive

-) gpr_atm_no_barrier_load should actually return something.
-) If compiling under mingw32, your compiler is gcc and gcc atomics become available.

Adds back calls to #finish at the end of server calls

Exposes the metadata method in server-side ActiveCall view classes

Add csharp server

wrap refresh token credentials in c++

Fixes reference to variable in the auth package

Unconditionally add a newline if a test times out or fails.

Failure should generally result in output unless something goes wrong,
but timeout currently doesn't, but should be printed 100% of the time.

Factor out interface-specific early_adopter code

Refactors early_adopter such that interface-specific code is located in
the framework module as a submodule `alpha`.

Python refactor

This renaming has been incrementally happening for the last several
weeks and this change finishes it.

Use "host" header field if ":authority" is not present

They were two halves of the same whole.

Introduces "make test_python" which runs python tests.

Non-blocking Next method for C++ async completion queue

Adds a Makefile target called 'test_python' that first builds grpc, then call run_tests.py to run the python tests for the current configuration.

Add service name to Python early_adopter

Fix Python test ignorance of build config

Added support for sending metadata from clients.

Using cc and c++ instead of gcc and g++.

Removing src/core/security/roots.pem

I believe it was introduced by mistake here:
https://github.com/grpc/grpc/commit/3f1e69668642c42372b2e54c502458dc8dbba1bf