box / ClusterRunner / 1281

5%

Pull #274

travis-ci

Build refactor - Use FSM to track build state

- Add an FSM implementation (based on Fysom) to track the state of a
build.
- Remove a bunch of flags related to tracking state from the Build
class and use the FSM instead.
- Fix tests.

I've left a bunch of WIP (work-in-progess) notes since this is part of
a much larger refactoring and I didn't want to do it all in one
commit.

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