Don't run test when in dev mode.

The browser spec executes way faster than the CLI spec.
Fix issues with replacing multiple views.

* add specs for re-appending and cleaning up multiple views at once
* fix several issues with appended views.
Implement plugin option.

Add a `setView` plugin option to use setElement intead of `.html`.  The
spec for this may be incomplete but it's working for my current use
case.