[wip/1.0] Use $this->openid->data or $_GET for raw data

[glen-84]

Certain OpenID providers, for example Steam, will not provide any attributes, so using $this->openid->getAttributes() will return an empty array, causing the response validation to fail (missing required parameter "raw").

I suggest using $this->openid->data or $_GET for raw data instead.

This will probably mean that the responseMap will change from (for example):

'info.email' => 'contact/email'

To:

'info.email' => 'openid_ext1_value_contact_email'

etc.