Spec for delete sample collection
Fix specs
Add SampleCollectionMetadata persistor, which do not load the samples of the collection
Add boolean condition to display or not the samples associated with the collection
Add SampleCollectionMetadata sequel persistor
Add sample_collections attribute to the sample resource
Load the collections of the sample only if the sample is not loaded from the collection itself
Display the collections of the sample
Load the sample collections metadata which contain the samples
Add specs for getting a sample resource which belongs to collections