Results 2 issues of Shawn Eisenach

@after_all seems to be firing after every feature run, not after all the features. A run with lettuce ![screen shot 2014-08-06 at 2 46 27 pm](https://cloud.githubusercontent.com/assets/231390/3834633/892d9b4c-1db3-11e4-9c10-2a3c19c34552.png) A run with lettuce_webdriver...

Our tests running against Browserstack sometimes falsely report all test passing. While strictly speaking none of the tests failed, they certainly didn't all run. For example, ``` WebDriverException: Message: u'5...