Pull ServiceTypes out of database constants
Pull ServiceTypes out of database constants

+ ServiceType.seed_somerville_service_types is already called in the migrations, this double-calls it

jhilde/studentinsights,studentinsights/studentinsights,jhilde/studentinsights,studentinsights/studentinsights,studentinsights/studentinsights,jhilde/studentinsights,jhilde/studentinsights,studentinsights/studentinsights