Server builder plugin

Fix Go perftests and a few other fixes.

Add a C++ test for server returning error with debug info in trailer.

Release 0.14 upmerge

Add a script to generate a gource log for all grpc repos

Update release version to 0.14.2-pre1

Update release version to 0.14.1

Upmerge from 0.14.0, again :D

C#: Add more examples and improve existing ones

Allow Ruby client code to set a user agent

Fix formatting (to fix sanity check on master)

Release 0.14 upmerge

Integrate Go qps worker

Bumping protobuf submodule to beta-3-pre1.

Add some missing directories to package.json

Fix encoding and piping problems with Node plugin wrapper

Added true async qps streaming client

C#: make writes throw RpcException if the client-side call has already finished

Interop/Stress client that is resilient to server restarts

Add support for running netperf as part of benchmarks.

Make Node build_package script consistent with grpc-tools package.json file

Change argument type to avoid undefined behavior