Create a new persona store.
This store will have no personas to begin with; use FolksDummy.PersonaStore.register_personas to add some, then call FolksDummy.PersonaStore.reach_quiescence to signal the store reaching quiescence.
| id | The new store's ID. | 
| display_name | The new store's display name. | 
| always_writeable_properties | The set of always writeable properties. | 
0.9.7