* duration was not actually defined in Travis.Job, which may have caused
bugs when combined with partial record loading (so for example it was
ok on a refresh, but may have been broken on update)
* notStarted was not a dependency of duration
We no longer need this check, because it was only relevant with Ember
Data. Additionally it was a cause of a travis-ci/travis-ci#1992, because
of wrong syntax:
unless someFunction false or true
will only check for a result of someFunction with an argument being the
result of `or` expression.
