Merge github.com:grpc/grpc into c++lame

BUILD

CMakeLists.txt

Makefile

binding.gyp

build.yaml

config.m4

gRPC-Core.podspec

grpc.gemspec

include/grpc/impl/codegen/atm_windows.h

package.xml

src/core/lib/iomgr/ev_epoll_linux.c

src/core/lib/iomgr/lockfree_event.c

src/core/lib/iomgr/lockfree_event.h

src/core/lib/security/credentials/credentials.h

src/python/grpcio/grpc_core_dependencies.py

templates/binding.gyp.template

test/core/iomgr/ev_epoll_linux_test.c

tools/doxygen/Doxyfile.c++.internal

tools/doxygen/Doxyfile.core.internal

tools/run_tests/generated/sources_and_headers.json