- named run_batch rather than start_batch
- this is because the func starts the batch, but additionally waits for it to
  complete

- allows it to be used from other files, e.g, in Call#run_batch
- this keeps code related to releasing the GIL during #pluck in one place

Define a smoke test for performance work, fix some bugs

Have the secure credentials in separate header files.

Fixes the Makefile template to link .so.<MAJOR_VERSION>

This resolves a blocker stopping a clean linuxbrew install to work with one of
the wrapped libraries.

Conflicts:
	Makefile

Mac fixes

Splitting gRPC service class codegen into its own set of files.

Add auth interop for Python

Also adds the commands to the grpc_docker shell library script to
support running in docker.

Use the release tag specified by the version

Fixed memory leaks in PHP extension code

Added script to generate test .php files from .proto files

Allow specifying warmup, benchmark times