Merge branch 'master' into why_lever

PYTHON-MANIFEST.in

include/grpc++/create_channel.h

package.json

requirements.txt

setup.py

src/node/performance/worker.js

src/python/grpcio/README.rst

src/python/grpcio/commands.py

src/python/grpcio/precompiled.py

templates/package.json.template

test/distrib/node/run_distrib_test.sh

tools/dockerfile/distribtest/python_fedora21_x64/Dockerfile

tools/dockerfile/distribtest/ruby_fedora21_x64/Dockerfile

tools/run_tests/build_artifact_node.sh

tools/run_tests/build_artifact_python.sh

tools/run_tests/build_package_node.sh

tools/run_tests/distribtest_targets.py