Added progress bar to file downloads

Added two new API calls, to update the server to a particular version and to get the updater status

You can now update through the UI, and a status dialog displays after

src/app/dialogs/update-progress-dialog/update-progress-dialog.component.spec.ts

@@ -0,0 +1,25 @@
+import { async, ComponentFixture, TestBed } from '@angular/core/testing';
+
+import { UpdateProgressDialogComponent } from './update-progress-dialog.component';
+
+describe('UpdateProgressDialogComponent', () => {
+  let component: UpdateProgressDialogComponent;
+  let fixture: ComponentFixture<UpdateProgressDialogComponent>;
+
+  beforeEach(async(() => {
+    TestBed.configureTestingModule({
+      declarations: [ UpdateProgressDialogComponent ]
+    })
+    .compileComponents();
+  }));
+
+  beforeEach(() => {
+    fixture = TestBed.createComponent(UpdateProgressDialogComponent);
+    component = fixture.componentInstance;
+    fixture.detectChanges();
+  });
+
+  it('should create', () => {
+    expect(component).toBeTruthy();
+  });
+});