Add empty file for backend implementation.
Add test case declartion.
Add CommonsIO dependency.
Add backend implementation with TODOs. Refs #4
Add test unit and import entries.
Change classpath and maven configuration.
Move test case file to another package.
Add test configuration and test case.
Complete error message on test units.
Fix file serialization backend to support complex classes.
Merge branch 'feature-4-Backend_archivos'