Upgrade to Selenium 2.13.0

v2.12.0
=======

RC
  * Disabled web security checks for Chrome by default. 
  * Actually reenabling *safariproxy.

WebDriver
  * Firefox 8 support enabled
  * Added @Beta annotation. Any method marked with this may be deleted
    or changed without notification.
  * Added @Beta Window control for Firefox in Ruby and Java. This
    allows resizing and moving.
  * Renamed FirefoxProfile.enableNativeEvents() to
    FirefoxProfile.areNativeEventsEnabled(). Deprecated original
    method. Will be removed in 2.13.
  * Renamed FirefoxProfile.alwaysLoadNoFocusLib() to
    FirefoxProfile.shouldLoadNoFocusLib(). Deprecated original
    method. Will be removed in 2.13.
  * Better reporting of page size when attempting to move out of bounds.
  * More informative error message when a remote webdriver client
    fails to connect to the browser.
  * PageFactory now only decorates WebElement lists.
  * Calling WebElement.clear on a disabled or readOnly element will
    throw an InvalidElementStateException.
  * WebDriver.getWindowHandle will throw a NoSuchWindowException if
    the window is closed.
  * FIXED: 1498: HtmlUnit no longer finds containing element when
    searching by CSS.

Grid
  * Made Grid orphan check only apply to Se1 clients.

Atoms
  * Implemented clear action for contentEditable elements.