39. Angularjs route change events

   Different events that are triggered when a route change occurs in an angular application.
   Logging the events and event handler properties.

When route change/navigation occurs in angular application

$routeChangeStart
$locationChangeStart
$routeChangeSuccess
$locationChangeSuccess
                           events will be triggered.

now we will learn predefined events($routeChangeStart, $locationChangeStart) in more depth..

use Developer tools to know more all properties of each event parameter(event,next,current).