Branding: Initial branding of Groups for Tuakiri

Initial (and hopefully complete) commit on branding Groups for Tuakiri.

Replace all reference to AAF / AAF support with Tuakiri, update URLs as
needed.

Create branding images.

Files modified:

   groups/grails-app/i18n/messages-branding.properties
   groups/grails-app/i18n/messages.properties
   groups/grails-app/views/association/show.gsp
   groups/grails-app/views/dashboard/welcome.gsp
   groups/grails-app/views/finalization/error.gsp
   groups/grails-app/views/finalization/used.gsp
   groups/grails-app/views/layouts/email.gsp
   groups/grails-app/views/layouts/internal.gsp
   groups/grails-app/views/layouts/login.gsp
   groups/grails-app/views/layouts/myaccount.gsp
   groups/grails-app/views/layouts/public.gsp
   groups/grails-app/views/templates/_accountadministrators.gsp
   groups/grails-app/views/templates/branding/_topnavigation.gsp
   groups/grails-app/views/templates/managerolesubjects/apisubjects/_search.gsp
   groups/src/groovy/aaf/base/identity/role_invitation.gsp
   groups/src/groovy/aaf/pip/verify_aaf_account.gsp
   groups/web-app/images/branding/emailbranding_development.gif
   groups/web-app/images/branding/emailbranding_production.gif
   groups/web-app/images/branding/emailbranding_test.gif