Fixed

"Element not found" error so I have changed the xpath for some listings
and so they are found now.
Slash removed

It seems that driver.get(self.base_url + "/") was adding a second / to
the self.base_url and this failed the tests.
Fixing the code

Minor changed to the code syntax and changed the desired_capabilities =
webdriver.DesiredCapabilities. and the desired_capabilities['name'] of
Sign up (Sales) Safari test.
Fixed

Changed the xpath of a listing in order to be find.
Name changed

Changed the desired_capabilities['name'] into "Set an Email Alert"
Fixed the broken link

This test has a saucelabs bug (the BUY AN APARTMENT FROM <neighborhood>"
was leading to the Rentals page instead of Sales). Upgraded to Firefox
27 and changed from css_selector to xpath and vice-versa. The test is
running OK now.