Fixed the password-strength-view.

Everything is now working, thanks to this post on stackoverflow:
http://stackoverflow.com/a/23250935/2517996. Even uses less lines.
Added dropbox/zxcvbn.

https://github.com/dropbox/zxcvbn/blob/master/zxcvbn.js:
Accessed 25.04.2014
Date of file 03.02.2013
Removed 'test' [code].