Merge pull request grpc#214 from nicolasnoble/backport

Backport of grpc#212

Merge pull request grpc#182 from murgatroid99/version_1.9.1

Update version to 1.9.1

Merge pull request grpc#174 from murgatroid99/v1.9.0_update

Update version to 1.9.0

Merge pull request grpc#150 from murgatroid99/v1.8.4_update

Update version and submodule to 1.8.4

Merge pull request grpc#124 from murgatroid99/v1.8.0_update

Update to v1.8.0

Merge pull request grpc#115 from murgatroid99/update_v1.7.3

Update v1.7.x branch to 1.7.3

Merge pull request grpc#96 from murgatroid99/v1.7.2_update

Update version to 1.7.2

Merge pull request grpc#77 from murgatroid99/v1.7.1_changes

Update to 1.7.1, add Node 9 support, fix generated file permissions

Merge pull request grpc#74 from murgatroid99/v1.7.1_update

Update submodule to v1.7.0 and regenerate packages