managed 404 response code for getAssociation, CouchDBTuple changed the type of columNames and Values from String[] and Object[] to List<String> and List<Object> to manage the creation of an empty Tuple
added type association and entity in order to retrieve the total number of associations and entities, implemented methods to retrieve the total number of associations and entities (need to implement views on CouchDB)
done a little re-design, changed the CouchDBDocument from interface to abstract class, corrected a couple of typo in class names
created DesignDocument to create CouchDB Views for retrieving the number of stored associations and entities
created test fro getNumberOfAssociations, fixed a bug in EntitiesAndAssociationsCardinality class