Add online account support in the webapp container.
A new "accountProvider" command line parameter has been added to allow one to specify an account provider for the specific webapp launch. When used, one can specify a given provider, e.g. "facebook", to pull existing accounts (if any) from the specified provider
from Online Accounts.
When the provider does not have any existing account, an option to delegate the creation of such an account to OA is provided. It is also possible to skip the step and go straight to the target url.