update dependencies and fix unit tests

src/app/app.module.ts

@@ -1,6 +1,6 @@
 import 'zone.js/dist/zone-mix';
 import 'reflect-metadata';
-import 'polyfills';
+import '../polyfills';
 import { BrowserModule } from '@angular/platform-browser';
 import { NgModule } from '@angular/core';
 import { FormsModule } from '@angular/forms';
@@ -15,7 +15,7 @@ import { TranslateHttpLoader } from '@ngx-translate/http-loader';
 
 import { ElectronService } from './providers/electron.service';
 
-import { WebviewDirective } from 'app/directives/webview.directive';
+import { WebviewDirective } from './directives/webview.directive';
 
 import { AppComponent } from './app.component';
 import { HomeComponent } from './components/home/home.component';