Several additions including a JsSelector and running unit tests through Chrome

Additions:
  - findElementsBy magic methods in WebDriver
  - environment variables to change the tests url and browser
  - an environment variable to specify tests should be run in a single browser instance (speed improvement)
  - innerHTML and outerHTML convenience methods in WebElement
  - find elements By user javascript selector
  - new tab hack in TargetLocator

Modifications:
  - Docblock and PhpStorm code inspection fixes
  - better timing precision in WebDriverWait->until
  - moved phpunit.xml to phpunit.xml.dist (and generate code coverage)