Revive it in tests as well

This commit may or may not be a great tradeoff.

Fix docker inception for now

Add a dummy reference to prevent unused variable warning if there is …

type

Bring back gpr

it was not actually even included in the library or the test suite.

Upmerge changes from release-0_13

operator overloads)

Pass delete[] explicitely to Nan::NewBuffer.

Fix 1 second stall on Windows

Sync java options in example protos

Merge from 0.13 and regen projects.

Conflicts:
	build.yaml
	src/ruby/lib/grpc/version.rb

Enable Node distrib tests on Mac on release-0_13

Use the Nan::NewBuffer version that accepts an explicit callback
deallocating buffers. This way we'll be resilient to different nan/node
versions.

Fixes grpc/grpc#4867

Test fix php interop test composer install git clone problem 

Fix some C# copyrights

Fixing Ruby binary build (again).

Added missing codegen includes