Correcting dismissal of onBeforeUnload dialogs.

We now notify the button's immediate parent, instead of sending a message
to the button. Sending the BM_CLICK message to the button can fail if the
dialog doesn't have the system focus.
Adding minimal code style setting for python
IDEA 12 wants this change. I hope I'll not broke IDEA 11 compatibility.
But in the case, please, time to upgrade to 12 ;)
Deleting deprecated XPathLookupException
Removing deprecated proxies that are unified in DefaultRemoteProxy
Removing deprecated exception (that was subject to remove in 2.28 but
managed to survive till now)
Removing tests for SeleniumBackedWebDriver
Removing SelenseBackedWebDriver
Fixing "do we need to scroll" condition: we do if the element is not in
the parent overflow. Fixes issue 4099
Ignoring the new test in Chrome (failed), and updating atoms.h
Fixing visibility check for elements in parent overflow. Fixes issue 5518
Improving overflow handling in isShown atom. A bunch of new tests added
for Java binding, but someone should reimplement them in JavaScript too
Adding appropriate @Ignore-s to new tests
 * Correcting dismissal of dialogs on browser quit.

The IESession object already had code to check that the IECommandExecutor
had fully quit before shutting down the thread on which the executor was
running. However, it had no code to handle the case where all browser
instances for that session were not properly shut down. Now the session
will ask the executor to check one final time and make one last-ditch
effort to dismiss any dialogs and shut down the browser instances. Please
note that the best practice is to handle any alerts that may appear in web
pages being automated before executing driver.quit(); this should only be
used as last resort.
Updating .NET tests.
Adding a new test inspired by issue 5237
Removing deprecated methods in Locatable and Coordinates interfaces
Add missing return statement.

Fixes issue 5541.
Bump selenium-webdriver package to 2.32.1
Assume the window is closed on "can't access dead object" error.

Fixes issue 5237.