Fixture / Refactor scalastyle / builders
ScalaStyle Correction + Removed magicnumber rule + Added Jona's changes: TDD, Refactor
Minor fix, mockito on LibraryUsersTest + joda-convert added to pom, for error removal of joda-time constructor
Refactored LibrarySystem + TDD
Merge pull request #7 from cravacuore/develop

Jona's repo commit + Cravacuore's repo commit + ScalaStyle corrections