FAS-only authentication - https://github.com/zanata/zanata-server/pull/536

Squashed commit of the following:

commit 6b281d9240e9573174329459f6db15ff44a2e480
Author: Carlos A. Munoz <camunoz@redhat.com>
Date:   Thu Jul 31 15:32:53 2014 +1000

    rhbz1120016 - Organize redirection directives for Open id.

    This was leaving an unused scenario which was causing a blank page.

commit 86d181b0e223a7f7930da94cbe2dab11934397bd
Author: Carlos A. Munoz <camunoz@redhat.com>
Date:   Thu Jul 31 12:32:27 2014 +1000

    rhbz1120016 - Fix missing "Log In" button label.

commit e6333fe01b957ea03512f987d1497375c3dffbb7
Author: Carlos A. Munoz <camunoz@redhat.com>
Date:   Wed Jul 30 15:07:55 2014 +1000

    Code Review fixes.

commit 110db4032685f9e59eb4759602e9e81b25b3eb57
Author: Carlos A. Munoz <camunoz@redhat.com>
Date:   Tue Jul 22 14:41:04 2014 +1000

    rhbz1120016 - Allow single OpenId authentication.

    Offer a configuration setup that allows for just a single open id provider to be configured.