Bug fixing-update data collectors#15

[ambitious-octopus]

1. Changed attribute ticks to tick in model
2. Added attribute self.num_ticks(maximum number of ticks)
3. Added attributes self.model_reporters and self.agent_reporters
4. Changed function init_collector
5. Changed run() and setup() definition
6. Added save_data() function
7. added extra.generate_collector_dicts()
8. added entities.Person.dump_net()
9. Solved 2 minor bugs (1. migration, 2. setup_oc_groups)