Test scenarios, not features! Four brew scenarios

Create scenarios for:
- [x] Scenario: local webdriver
  * runlocally: true
  * ondemand: false
- [x] Scenario: Selenium server
  * runlocally: false
  * ondemand: false
- [x] Scenario: Selenium server with Sauce Ondemand
  * runlocally: false
  * ondemand: true
  * browser: firefox
- [x] Scenario: Selenium server with Sauce Ondemand with a Chrome browser [commented out]
  * runlocally: false
  * ondemand: true
  * browser: chrome