Fix #110: Specifically support ngRoute and ui-router

Trying to be routing-agnostic isn't working for us
(see luisfarzati/angulartics#86 and luisfarzati/angulartics#114).

This PR intends to re-introduce specific support for the two most popular
routing modules: ngRoute and ui-router.

Tests have been updated to cover ngRoute and ui-router. I've implicitly
documented the minimum supported versions of both modules, using bower.json.

TODO:

* Update the README to explicitly document minimum supported versions of the
  routing modules.