* Vendor runtimeconfig
* Add support for RuntimeConfig config and variable resources
This allows users to create/manage Google RuntimeConfig resources and
variables. More information here:
https://cloud.google.com/deployment-manager/runtime-configurator/Closes#236
* Remove typo
* Use top-level declaration rather than init()
* Cleanup testing-related code by using ConflictsWith
Also adds better comments around how update works
