Add Angular-style e2e and unit test suite

[justmoon]

Currently we rely on a mixture of runic incantation, voodoo magic and sheer luck to prevent regressions in new versions of the client.

In the long run we need a test suite. Note this issue refers to the creation of a test suite. It will be considered closed when the infrastructure for that is in place. Adding tests will be an ongoing process.

[justmoon]

I looked into adding tests today. I wasn't able to get angular-scenario to recognize our tabmanager. This means that we have to either do some custom baking in our test suite, or we switch to the native tab handling, via ng-view (see #270),

[justinhernandez]

@justmoon what more needs to be done for this issue to be closed?

[justmoon]

Blocked by #377.