add lat_lng value to first location seed
mess with concert create form adding time_slots (won't work - bugs)
adjust concerts controller to accept multiple timeslots with timeslotsparams
merge with current generator branch
begin transition to new location model
add address input & zip to city state conversion to new location form
add lat/lng to new location form and plot on map
add reverse geo coding to seed locations, add concerts to location_show view, fix session bug