Properly handle case insensitive e-mail (closes #517)
Squashed commit of the following:

commit fefd63b9fe64f50f28bac962d773ed35a9170b8f
Author: replay <mauro.stettler@gmail.com>
Date:   Wed Feb 12 19:28:04 2014 +0300

    add request into the params of confirm_email method

    Conflicts:
    	allauth/account/adapter.py

commit bb2ab358d91cf56c132d0aa0572bcd0ebad929be
Author: replay <mauro.stettler@gmail.com>
Date:   Wed Feb 12 18:38:42 2014 +0300

    move email confirmation from model into adapter

    Conflicts:
    	allauth/account/adapter.py
add doc for signals email_confirmed and email_confirmation_sent (closes #537)
Switching to GET for LinkedIn access token (closes #542)
Fix a bug in custom signup form classes, which rejected classes that only implemented the new 'signup' method.
Merge pull request #548 from wli/master

Fix a bug in custom signup form classes, which rejected classes that only implemented the new 'signup' method.