[U] Update usage

src/components/app/app.ts

@@ -32,7 +32,7 @@ export default class App extends Vue
     // Loading error
     loadingError: boolean = false;
 
-    navigator: NavController = new NavController();
+    nav: NavController = new NavController();
 
     // Http Client
     static http: HttpUtils = new HttpUtils();

src/components/app/app.vue

@@ -4,16 +4,16 @@
         <navigation v-if="user != null"
                     :courses="gradedCourses"
                     :user="user"
-                    :nav="navigator"
+                    :nav="nav"
                     @sign-out="signOut" @select-time="selectTime">
         </navigation>
 
         <div id="app-content" v-if="assignmentsReady && loading === ''">
-            <overall v-if="selectedTab === 'overall'"
+            <overall v-if="nav.id === 'overall'"
                      :courses="gradedCourses">
             </overall>
-            <course-page v-if="selectedTab.split('/')[0] === 'course'"
+            <course-page v-if="nav.id === 'course'"
-                         :course="gradedCourses.find(c => +c.id === +selectedTab.split('/')[1])">
+                         :course="gradedCourses.find(c => +c.id === +nav.info.id)">
             </course-page>
         </div>
 

src/components/navigation/navigation.ts

@@ -70,7 +70,7 @@ export default class Navigation extends Vue
      */
     findNextCourse(indexOffset: number)
     {
-        return this.findCourse(this.nav.activeIndex.hash.split('/')[1], indexOffset);
+        return this.findCourse(this.nav.info.id, indexOffset);
     }
 
     /**

src/pages/overall/overall-course/course-head/course-head.vue

@@ -43,7 +43,7 @@
         redirect()
         {
             if (!this.clickable) return;
-            App.instance.navigator.updateIndex(this.course.urlIndex);
+            App.instance.nav.updateIndex(this.course.urlIndex);
         }
     }
 </script>