Build cleaner updates

Fix some memory leaks

Migrate the last of the Python code from Google-internal source control to git.

The source code is moved from src/python to
src/python/src. A setup.py is added at
src/python. The build_python.sh and
run_python.sh scripts are updated to build
and run the Python tests by building a
package and installing it in the developer's
Python 2.7 virtual environment.

Fix some typos

Add pprof support to qps client, server

Starts profiling on client and server.
On client, finishes after a test.
On the server, finishes after sigint.

Adding an editorconfig configuration file.

Check http://editorconfig.org/ for more information.

Updated PHP library to handle generated code without explicit references to grpc

Added handling for unimplemeneted methods on the server

Added stock service client and server

Make ASAN work to detect leaks

Fix a couple of PHP bugs that prevented the PHP interop test client from working

Refactor the code a little to make this easier to munge around.

Fix initialization compile error

Switched extension to return faster sliceable Buffers

Adding property sheets for OpenSSL and Winsock 2 libraries.

Fixing echo test.

Found another typo.

Enabling extra warnings during compilation, and fixing code to shun them.

Re-enabling errors on warning, disabling unused parameter warning, and fixing all subsequent errors.

Added cancellation interop tests to Node interop client