Modify extendModel/extendCollection to modify specific routes (issues 740 and 736).

...ute to match unique routes. 736: implemented Restangular.getFullRoute() to return the complete route chain for a particular element. Added underscore.js to jshint global ignore list. Updated documentation to reflect ability to use regular expressions in extendModel/extendCollection.
This is missing the `id` in the route actually.

Also, there's already a property for this: `getRestangularUrl()` with which you can get the element's URL. You don't need to implement this.