Merge branch 'master' into async_thread_stress_test

Makefile

binding.gyp

build.yaml

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

package.json

src/core/security/server_secure_chttp2.c

src/core/support/env_linux.c

src/core/support/wrap_memcpy.c

src/cpp/server/server_context.cc

src/ruby/ext/grpc/extconf.rb

templates/Makefile.template

templates/binding.gyp.template

test/core/surface/server_chttp2_test.c

test/cpp/end2end/async_end2end_test.cc

test/cpp/end2end/end2end_test.cc

test/cpp/end2end/test_service_impl.cc

test/cpp/end2end/test_service_impl.h

test/cpp/qps/limit_cores.cc

test/cpp/qps/limit_cores.h

tools/dockerfile/distribtest/csharp_jessie_x64/Dockerfile