Added default timestamp value to Column definition for checkins
Initialized database. Checkin data now used to create new checkins record
Attraction checkin_id updated with new checkin data
Add /get_markers functionality to display database checkins on map
Reloads map upon new checkin to show new markers
Added new attractions to database table to test checkins
Populated select options based on database table
Removed commented-out hard-coded markers
Made markers draggable. Dragging creates new checkin.