Merge github.com:grpc/grpc into compatibility_mode

BUILD

Makefile

PYTHON-MANIFEST.in

Rakefile

binding.gyp

build.yaml

examples/node/greeter_client.js

examples/node/greeter_server.js

examples/node/package.json

examples/node/route_guide/route_guide_client.js

examples/node/route_guide/route_guide_server.js

examples/objective-c/helloworld/main.m

examples/protos/helloworld.proto

examples/protos/route_guide.proto

gRPC.podspec

grpc.gemspec

include/grpc++/impl/codegen/async_unary_call.h

include/grpc++/impl/codegen/call.h

include/grpc++/impl/codegen/rpc_service_method.h

include/grpc++/impl/codegen/server_interface.h