Cucumber test for book
Fiksailtu: lisätty id organziation, series --> reference modeliin, cucumber testit bookille ja korjailtu controlleria
Merge pull request #24 from Eepa/tests

Tests
Created inproceeding cucumber tests and refactored article cucumber tests
Merge pull request #25 from Eepa/tests

Created inproceeding cucumber tests and refactored article cucumber tests