And free ops_array that was leaking.

Ensure tools are built during run_tests runs

The issue remains that we don't test our tools, but at least we test
that they compile.

Compression metadata

Clarify behavior of grpc_server_register_completion_queue

Performance-oriented server refactoring

Remove backup poller from GRPC core

Adding NPN support if ALPN support is not available.

fix json_rewrite_test CRLF handling

Corrects the cancel_after_first_response behaviour

- introduces a #wait method on the call operation view
- invokes #wait on a Notifier that is created for all operations
- ensures the Notifier is invoked if necessary whenever a client request
  completes
- updates the interop_test to use op.wait before checking if the call
  was cancelled.

Conflicts:
	gRPC.podspec
	tools/doxygen/Doxyfile.core.internal

Re-enabled warnings in the gRPC podspec

Adding clang packages for msan/tsan/asan testing.

Add package.xml file for pecl extension

prevent leaking gpr_slice in windows on_read()

Added missing but included headers to build.json

- ALPN may not be available:
  - because OpenSSL does not support it.
  - because one of the peers does not support it.
- Tested manually end to end by forcing TSI_OPENSSL_ALPN_SUPPORT to 0.
  Also tested if only one of the peers supports ALPN.

Conflicts:
	include/grpc/compression.h

Introduced compression levels as an abstraction for the actual algorithm

Disallow started request writers on GRPCCall init