Fix carousel

Signed-off-by: Matheus Agio Nerone <man13@inf.ufpr.br>

See merge request !38

Signed-off-by: Matheus Agio Nerone <man13@inf.ufpr.br>

Create LearningObject relations

Rake task to create the relations of LearningObjects from its metadata attribute.
To accomplish this, the organization of the Repositories methods were changed.

See merge request !33

Signed-off-by: Matheus Agio Nerone <man13@inf.ufpr.br>