Create interest points server for photographs

[Thinking-Dragon]

For this item to be accepted as complete:

• A package must be created under /interest_points ;
• A node called collector must be created inside the package ;
• The node must subscribe to /interest_points/add ;
• The node must subscribe to /interest_points/update ;
• The node must persist the interest points and modify them as needed ;
• The node must expose a service to get all currently interest points created until now.