Added missing 'prompt' parameter for Google

The 'prompt' parameter could be defined but was ignored when constructing the authorization URL.
Fixed bug. Bug: normalizer adds "?" suffix to $redirect_uri ("http://host.dev/login/check-facebook" => "http://host.dev/login/check-facebook?") and then facebook responses "Error validating verification code. Please make sure your redirect_uri is identical to the one you used in the OAuth dialog request".
Prepare release 0.3.3
Merge branch '0.3'
Merge branch 'hwi/master'