Update to protractor 5.x

[giggio]

5.0.0 was released: https://github.com/angular/protractor/releases/tag/5.0.0

[giggio]

BTW, I just tested it with Protractor 5 and it worked fine. I don't know if you are gonna have to change any tests or dev code, but it is running just fine.

[evilaliv3]

I confirm that also on GlobaLeaks all is working ok except for issue #23 that is now fixed by #24