signup 5.x-2.2

Bug fixes since 5.x-2.1:

• #163257 by dww: Anonymous users could cancel all anonymous signups once the signup limit is reached or signups are otherwise closed. The bug was introduced in version 5.x-2.1.
• #160862 by adrinux and dww: Fixed paging on signup admin form (admin/content/signup) due to missing count query.
• #142402 by cpisto: Fixed SQL bug on PgSQL when event.module is enabled.
• #147546 by stBorchert: Removed call to undefined _event_date() when using signup broadcast if event.module is not installed.
• #158688 by m3avrck: Fixed signup.js to work with JavaScript aggregator.
• Code style fixes (thanks to the coder.module)

New features since 5.x-2.1:

• #154580 by killes and dww: Refactored code to support different event-related backend modules. Both event 5.x-1.x and event 5.x-2.x are supported, and adding date.module support will now be easy.