Fixes #20 - angular integration fails with angular router

@ejsmith I'm thinking that it might be best to remove all of our route
logic for 404's and feature usage and have a gist with how to do it.. It
would cut down the size.. and keep people from blowing through their
plan limits.

Author: niemyjski

dist/integrations/angular.js

@@ -43,6 +43,10 @@ angular.module('exceptionless', [])
   }])
   .run(['$rootScope', '$ExceptionlessClient', function($rootScope, $ExceptionlessClient) {
     $rootScope.$on('$routeChangeSuccess', function(event, next, current) {
+      if (!current) {
+        return;
+      }
+
       $ExceptionlessClient.createFeatureUsage(current.name)
         .setProperty('next', next)
         .setProperty('current', current)
@@ -57,7 +61,7 @@ angular.module('exceptionless', [])
     });
 
     $rootScope.$on('$stateChangeSuccess', function(event, toState, toParams, fromState, fromParams) {
-      if (toState.name === 'otherwise') {
+      if (!toState || toState.name === 'otherwise') {
         return;
       }
 
@@ -70,6 +74,10 @@ angular.module('exceptionless', [])
     });
 
     $rootScope.$on('$stateNotFound', function(event, unfoundState, fromState, fromParams) {
+      if (!unfoundState) {
+        return;
+      }
+
       $ExceptionlessClient.createNotFound(unfoundState.to)
         .setProperty('unfoundState', unfoundState)
         .setProperty('fromState', fromState)