Updated friends manager, almost, if not fully feature complete
removed getAsync method from the friends manager, one should use the synchronous methods and the load method to load data from the database
Added Notifications and Notifications manager, WIP
Added BaseManager, other managers inherit from it
Changed serialization and deserialization of objects
Fixed tests
Added another test case for nested friends and notifications
Added tests and functionality for friend requests
Merge pull request #1 from fatalerrorbg/friendsManagement

Friends management