Resolve pernicious race between destructor and thread functions by insisting that destructor is invoked after the class has gone back to being a harmless single-threaded thing.

This reveals an issue that needs to be solved:
D0713 14:48:28.049861213   14503 server.c:704]               Waiting for 44 channels and 0/1 listeners to be destroyed before shutting down server

Changed the README file of PHP example

Change cancelled to cancelled?

Return success status of grpc_byte_buffer_reader_init

App to manually test behavior under changing connectivity conditions

Added missing dependencies to grpc++_base

Fix TSAN failure in tcp_server (shown via qps_openloop_test)

Merge branch 'protobuf-submodule-update' of https://github.com/nicolasnoble/grpc into bb_reader_error

Ruby garbage collection fixes

removed unused version of status_code_enum.h

Initialize variables in surface/call.c

Make running individual Python tests less painful

Change port_server.py to use port 32766

Merge branch 'complicated-syndrome-of-the-alien-kind' of https://github.com/soltanmm/grpc into bb_reader_error

Expunge all references to zookeeper

Add http2 status code in error_message if it's not 200

Contributed cmake project files.

Removed invalid sentence from interop flag description