Use updated live.com endpoints.

We've had a problems with the live.com provider intermittently failing. Today it started failing all the time returning the error message 'The HTTP request was forbidden with client authentication scheme "Anonymous"'.

According to http://social.msdn.microsoft.com/Forums/onedrive/en-US/577aa2de-9409-405a-835f-327e06965f52/oauth-service-down?forum=messengerconnect — which may not be the most authoritative source — there are new endpoints that should be used.

The patch simply uses these new endpoints and our problems went away.