Configured work on Signups module
Signups Works, Bugs Fixed

Basic signup functionality now seems to work (timezones need further testing).
Public aquarium view cache TTL now uses TTL in config/cache.php
Equipment maintenance now takes into account log updates which were not maintenances.
Made equipment log maintenance a scope.
Worked up an index page
Cleanups for signup module, nav bar updates

Navbar now includes link to current aquarium