Remove a useless assignment
Use the ternary operator to define the location

To avoid extra assignments let's rely on the ternary operator to define
the location depending on the access type of the application.

Thanks @notgary
Get rid of the selenium webdriver

Since I'm using the UX version of Firefox (which is 28 as of today), I'm
unable to get Selenium working with this version so let's rely on the
webkit driver.
Get rid of the custom require for rubyzip