copied contacts and friends from DataMapper's tests.
fixed namespace for Cena's test.
added WScore\tests to autoloader.
added initial code for testing CenaIO role.
fixed to point to correct model class.
added initial test on CenaManager.
fixed to specify exact class name that is returned.
tested; fixed getEntity to specify cenaID's identifier.
added to set model/entity name. returns entity not collection.
more tests on CenaManager.
basic test on CenaIO role.