Stackdriver code deploy and annotation module

This module implements the Stackdriver [code deploy](http://feedback.stackdriver.com/knowledgebase/articles/212917-sending-code-deploy-events-to-stackdriver) and [annotation](http://feedback.stackdriver.com/knowledgebase/articles/260455-sending-annotation-events-to-stackdriver) API. 

NOTE: The module works fine but `make webdocs` does not work for me and I have no idea why. It fails with the error [in this gist](https://gist.github.com/bwhaley/10508449). I asked in IRC chat but nobody helped. Happy to fix if you can see what the problem is.