Implement Checker to check Books, add checker injection with Guice.
Add real rosa data for testing, giving 2 'collections' in test resources.
Add a HasId interface to those model objects that represent real items in the archive.
Load collection tested.
Merge branch 'model-hasId-interface' into develop

Conflicts:
	rosa-archive/rosa-archive-core/src/main/java/rosa/archive/core/store/DefaultStore.java
Gave BookCollection an ID field.
Add check filenames in book archive.
Code cleanup. Consolidated test setups into base test class.