text: Title: DeprecationWarning in webdriver.switch_to_window
  Body: I am using code such as the following, to switch the 'current' window:
  
  ```
  browser.windows.current = browser.windows[1]
  ```
  
  This works fine, but I see the following warning in the terminal:
  
  ```
  $VIRTUAL_ENV/local/lib/python2.7/site-packages/selenium/webdriver/remote/webdriver.py:530: DeprecationWarning: use driver.switch_to.window instead
    warnings.warn("use driver.switch_to.window instead", DeprecationWarning)
  ```
  
  Using Selenium 2.52.0 (installed from pypi)
  