REST API integration tests

[chamerling]

I started a module in the governance to create integration test of the REST API. This will need to have a complete platform running locally.
Skeleton is already available, need some work to initialize and create scenarios.

Source are under https://github.com/play-project/play-governance/tree/master/governance-itest

[stuehmer]

I can provide dummy event patterns for testing permissions when needed!

Let me know.