Moving WebDriver to CR.

Hi Mike, Philippe,

All the changes that were considered breaking have now landed in the
specification. We have outstanding bugs for undefined or slightly wrong
implementation steps but the API is not going to change.

We have implementations being working on by Microsoft, Apple, Google,
Mozilla and the Selenium Project. Google has graciously offered a
contractor for helping with the testing effort. They are doing great work
already.

I do expect that there will be more bugs to fall out  as more
implementations are finished but, as mentioned before, this will not impact
the APIs.

David