Merge branch 'master' into wheezy

.travis.yml

BUILD

Makefile

binding.gyp

build.yaml

composer.json

config.m4

doc/c-style-guide.md

doc/command_line_tool.md

doc/cpp-style-guide.md

doc/statuscodes.md

examples/cpp/helloworld/greeter_async_client.cc

examples/cpp/helloworld/greeter_async_server.cc

examples/php/greeter_client.php

examples/php/helloworld.php

examples/php/route_guide/route_guide.php

examples/php/route_guide/route_guide_client.php

gRPC.podspec

grpc.def

grpc.gemspec