After being able to reproduce the errors exactly by making certain
elements unfindable, I concluded that the issues we've been seeing
on headless jenkins runs are due to execution happening too quickly
and elements not loading in time to be interacted with.

The fix is to make liberal use of Jasmine 1.3 `runs` and `waitsFor`
functionality, to ensure that execution happens in the order that
we want, with rendering being checked before proceeding.

Once again, I can't be 100% sure that this fixes the Jenkins errors,
as those are very hard to reliably reproduce, but this is an
educated guess at fixing the problem with no drawbacks, as I've
been able to successfully run all tests locally.