Fix registration link to point at our own site.
update the symfony packages in composer to bring .lock inline with .json and solve a problem with mismatched dependencies
Merge branch 'update-composer'
Call Slim's notFound() when we can't load an event from a cached talk stub's event_uri.
namespace for Slim
Merge branch 'akrabat-fix_slim_exception_pass'
Merge branch 'akrabat-homepage-registration-link'