Add option for test verbosity.
Memoize calls to Terminal.
Add tests for InterfaceRenderer.
Increase test coverage.
Add tests for #enqueue method, return interface after enqueuing.
Increase test coverage.
Remove unnecessary line.
Increase test coverage, also;

- Setting current on interface needs to use self.
- Parser doesn't send JSON to the compositor.
Merge pull request #33 from gavinlaking/twerks

Minor twerks.