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

also removes git-lfs from repo

fixes #228

Closes #232

.gitattributes

@@ -1,2 +0,0 @@
-# Files ending with `.screenshot.png` will be stored using `git-lfs` rather than stored in the git repository
-*.screenshot.png filter=lfs diff=lfs merge=lfs -text

e2e/index.e2e.js

@@ -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');
     });
   });
 });