build fanbase and location models, add associations

**USER**: habtm artists,  habtm location, has_many events thru artists, habtm fanbases
**ARTIST**: habtm users, has_many events, has_many fanbases
**EVENT**: belongs_to artist, belongs_to location (change city to this? and nested attribute to save city to location??)
**LOCATION**: habtm user, has_many events, has_many fanbases
**FANBASE**: habtm user, belongs to artist, belong_to location
fanbase model to describe relationship of user,artist model
location model created to replace city/greater area attribute in events and make a place to save user city preference, will look to add some sort of region/prximity attribute for location