Fix for XOAuth SMTP settings.  Expands on fix by jonpierce. 

_From @molsder on April 3, 2011 16:48_

Fix for XOAuth SMTP settings.  Expands on fix by jonpierce.  Includes access token with consumer required for sending messages.

Hi,

I needed this modification to get sending messages to work with XOAuth.  I branched it off the v0.4.0 tag.

Regards,
- Marcel

_Copied from original issue: nu7hatch/gmail/pull/24_
