Added maven archetype generated classes
Added ISBNChecker class
Added Eclipse generated settings to .gitignore
Implemented ISBNChecker and added Book class
Implemented test for ISBNChecker
ISBNChecker bug-fix
Removed references from test classes
Added Author and Person entities
Added StorageLocation entity
Added Library entity and LiberUrosRoot concept
Changed project name
Added Copy entity
Added DTOs package
Added methods to get entities from root and verify if entities exist
Added verifications to make sure Author, Book, Library and Person are unique
Added services to create books, authos, libraries and persons
Added services to create books, authos, libraries and persons
Added service to create copy
Added service to create storage spaces
Added exceptions for entities that do not exist