simplify trigger logic a little
Improve TriggerableScheduler tests to be less fake.
add support for buildrequest.waited_for
fix ITriggerableScheduler, add interface coverage
fix fake TriggerableScheduler. Add coverage. Fix Trigger step.
assert waited_for type checking
coverage for triggered buildrequest.submitted_at
Merge branch 'buck-nine-triggerstep-sets-wait_for' of git://github.com/bukzor/buildbot into nine
remove assertion from production code
rename classes so as not to make pylint think they're interfaces