fix link
Drop JQuery-UI. Fixes Issue #353 partly
Merge pull request #454 from hennevogel/drop-jquery-ui

Drop JQuery-UI
Merge pull request #459 from differentreality/fix_contributing_link

fix link
Introduces new RegistrationPeriod Object for Conference
#416
Removes stats controller
Merge pull request #445 from ChrisBr/refactor_registration_period

Introduces new registration period object
allow for organizers to also manage users
make second user admin
address the issue of second user becoming an admin automatically.
fix
User deletion