0.0-3 Reverted behaviour of is_na, is_not_na to prevent breaks in dependencies.
0.0-2 Added Dutch, French, German, Greek, Hungarian, Korean, Russian, Swedish, 
      Turkish, and Ukranian translations.
      Added assert_are_identical for comparing two objects.
      More README.
0.0-1 Content extracted from assertive 0.2-7, and tidied.
