Determine a good abstraction for simulation tests

[irapha]

It'd be interesting to have some abstraction that handles some of the simulation testing needs. For instance, making sure that a robot reaches a certain region of the world within some timeout, or making sure that a robot doesn't touch obstacles when moving, etc.

This is going to warrant a considerable amount of discussion, since getting this abstraction right, and in a generalizable way (that works for more than just buzzmobile) is very important.

Because testing the framework currently relies on our experience developing buzzmobile, I'd say this issue is somewhat blocked by gtagency/buzzmobile#183. Until we have actually made worlds and scenarios with pass/fail conditions, it'll be hard to determine a good abstraction.