[Bug] Parallax doesn't tear its self down completely

[mike-north]

The following Materialize code registers various listeners, which should be torn down in the component's willDestroyElement hook

this.$('.parallax').parallax();

Potentially this will entail adding some "cleanup" methods to the Materialize project, which can then be called by this component

[jacobq]

Will use .destroy() method for this http://next.materializecss.com/parallax.html#methods