Update to use transition hook API instead of state change events

[p0lar-bear]

As I said in #159:

Also, I think it's prudent to call attention to the fact that these state change events were deprecated with ui-router v1.0. The ui-router team has provided polyfills for them, and while this is a valid stopgap, this breadcrumb module should be updated to use the transition hook API instead of these events.

If I can find the time I could look into making these changes myself, I'll do so and submit a pull request, but at the moment my hands are tied and can't do much more than call attention to and whine about it.