added support for logout redirect

can be used to prevent NotLoggedInException from logout url eg /login?logout=1

Release 1.1.0

Changed: Model initialisation to allow easily overriding the model class
Added: Support for multiple URLs protected by different LoginProviders

1.0.2

Merge pull request #9 from RhubarbPHP/hotfix/UserIdentityColumnSupport

Hotfix - user identity column support

1.0.0

Fix for consistency errors when not using username field