Added timeout to port server

Split incoming initial and trailing metadata in Ruby calls

Make handlers optional at server construction

Fix Python interop unit-tests on Windows

Fix _Rendezvous.exception for successful calls

Support composition of arbitrarily many CallCredentials objects

Split Node health check code into a separate package and make it use static codegen

Reduce default max message size

Updated example codegen to use grpcio-tools

Now reasonable defaults are auto-detected by platform (and by specific
Python implementation).

The modified link command was originally taken from a Python 2.x distutils.

Migrated python performance tests to use GA API

Removed cython client-side call tracking

Stress tests: Fix metrics-client logging

Make PHP work correctly when receiving a compressed message

PHP: add warning about shutdown function

Change the return status codes according to the doc

Merge 0.14 into master

Changed the README file of PHP example

This ensures sync calls get cancelled after
a keyboard interrupt, as well as all calls
getting destroyed before grpc_shutdown()

Change cancelled to cancelled?