fix(e2e): removes screenshot directory and code to generate screenshots

also removes git-lfs from repo

fixes #228

Closes #232

Author: Robert Messerle

.gitattributes

@@ -5,7 +5,6 @@ describe('hello, protractor', function () {
     browser.get('/');
     it('should have a title', function () {
       expect(browser.getTitle()).toBe('Material2');
-      screenshot('demo page: index');
     });
   });
 });