Merge branch 'master' into epoll_changes

.travis.yml

BUILD

Makefile

binding.gyp

build.yaml

config.m4

gRPC.podspec

grpc.gemspec

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

include/grpc++/server_builder.h

include/grpc/impl/codegen/log.h

include/grpc/impl/codegen/port_platform.h

include/grpc/support/string_util.h

package.xml

src/compiler/python_generator.cc

src/compiler/python_generator.h

src/compiler/python_plugin.cc

src/core/ext/lb_policy/round_robin/round_robin.c

src/core/ext/resolver/dns/native/dns_resolver.c

...core/ext/transport/chttp2/server/insecure/server_chttp2.c