added 'houses' app in URLConf and its namespace='houses'
added 'House Management' web page
added a navigation bar in House Management
added a table in 'House Management'
added 'date_of_birth' when editing an account in admin
added 'date of birth' field for any user to update profile
added 'current_occupant' method in Bunk model
added a table of all houses, rooms, bunks, etc. in "House Management"