Merge github.com:grpc/grpc into epex5

BUILD

CMakeLists.txt

Makefile

WORKSPACE

bazel/grpc_build_system.bzl

binding.gyp

build.yaml

composer.json

config.m4

doc/unit_testing.md

examples/BUILD

examples/php/composer.json

gRPC-Core.podspec

grpc.gemspec

include/grpc++/server_builder.h

include/grpc/impl/codegen/grpc_types.h

include/grpc/support/workaround_list.h

package.xml

src/compiler/config.h

src/compiler/cpp_generator.cc