Lots of new methods in managers
Merge branch 'master' of github.com:faern/book-a-hobbit

Conflicts:
	se.chalmers.TDA593.Book-a-Hobbit/src/hobbit/model/InventoryManager.java
	se.chalmers.TDA593.Book-a-Hobbit/src/hobbit/model/impl/InventoryManagerImpl.java
	se.chalmers.TDA593.Book-a-Hobbit/src/hobbit/model/impl/TypeControllerImpl.java