Merge branch 'filter_call_init_failure' into filter_api

.travis.yml

BUILD

Makefile

PYTHON-MANIFEST.in

binding.gyp

build.yaml

config.m4

doc/cpp-style-guide.md

doc/interop-test-descriptions.md

examples/python/route_guide/route_guide_server.py

gRPC.podspec

grpc.def

grpc.gemspec

include/grpc++/channel_filter.h

include/grpc++/ext/proto_server_reflection_plugin.h

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

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

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

include/grpc++/impl/server_builder_option.h

include/grpc++/server_builder.h