Reminder service and API

Patient API extended to include reminders
Patient service implemented
Tests written
Updated service to fit API
UI and controller for Reminders added

Commented out a test that i didn’t understand -> have to follow up on
that
UI looks like shit so maybe someone (Frankie) wants to take a look at
it?
Reminderservice added to index
Started initial work on the calendar for reminders
Fixed Conflicts and merged
Added Read operation on the calendar for reminders. Added reminders to db script
Started implementing update of reminders via drag and drop on calendar
Merge pull request #15 from knotsoftware/task-model

Reminder service and API