Merging DB

Let's see. Merge now contains:

- DB with two tables:
 - Users
 - Geo_Pic
 - (gotta init_db() first)
- Methods:
 - add_user
 - updt_pass
 - is_valid_user
 - add_stats
 - get_user
 - users_by_score
 - add_geo_pic
 - pic_by_loc
 - pics_in_prox