updated gemfile and added factories for testing, updated to postgres in database configs, updated the gitignore file
added dog, profile, frienship, pending_friendship, message, event, event_attedance, and inbox_message migrations
added dog model, spec, and associations
added profile model, spec, and associations
added event model, spec, and associations
added message model, spec, and associations
added event_attendance model, spec, and associations
added pending_friendship and friendship  models, specs, and associations