User can log time
User can calculate total hours (WIP)
Finish up calculating total hours
Extract TimeDuration
Clean up
Gemify tracker-core
Add TrackerWeb
Add FlatUI + hardcoded current user
Add zeus
Add `Tracker::TimeLogs#each`
Add web frontend for adding entries
Add Tracker::TimeEntry#id
Add TimeEntryRepository#{find,find!} and specs
Removing entries