* t/03-language.t: adding some tests to check the 'language' attribute
* lib/Biblio/Record/USBC.pm: first increment to pass the tests against the 'language' attribute
* t/04-date.t: adding some tests to check the 'date' attribute
* lib/Biblio/Record/USBC.pm: first increment to pass the tests against the 'date' attribute
* t/05-title.t: adding some tests to check the 'title' attribute
* t/05-title.t: adding some method to be tested
* lib/Biblio/Record/USBC.pm: first (quite large) increment to pass the test against the 'title' attribute