Added ability to generate RSS feed URLs from the UI

Moved property sorting into its own component

src/app/components/sort-property/sort-property.component.spec.ts

@@ -0,0 +1,23 @@
+import { ComponentFixture, TestBed } from '@angular/core/testing';
+
+import { SortPropertyComponent } from './sort-property.component';
+
+describe('SortPropertyComponent', () => {
+  let component: SortPropertyComponent;
+  let fixture: ComponentFixture<SortPropertyComponent>;
+
+  beforeEach(async () => {
+    await TestBed.configureTestingModule({
+      declarations: [ SortPropertyComponent ]
+    })
+    .compileComponents();
+
+    fixture = TestBed.createComponent(SortPropertyComponent);
+    component = fixture.componentInstance;
+    fixture.detectChanges();
+  });
+
+  it('should create', () => {
+    expect(component).toBeTruthy();
+  });
+});