test(grid-list): add basic e2e tests (#1874)

Fixes #547.

e2e/components/grid-list/grid-list.e2e.ts

@@ -0,0 +1,12 @@
+describe('grid-list', () => {
+  beforeEach(() => browser.get('/grid-list'));
+
+  it('should render a grid list container', () => {
+    expect(element(by.css('md-grid-list')).isPresent()).toBe(true);
+  });
+
+  it('should render list items inside the grid list container', () => {
+    let container = element(by.css('md-grid-list'));
+    expect(container.isElementPresent(by.css('md-grid-tile'))).toBe(true);
+  });
+});