0.3.1

Added annotations @CheckFields and @CheckKeys:

1. Annotation @CheckFields with parameters:
   a) targetClass - required parameter, java class to check
   b) values - required parameter, fields names for check
   c) message - optional parameter, custom message for AssertionError.
2. Annotation @CheckKeys with parameters:
   a) baseName - required parameter, base name of ResourceBundle
   b) values - required parameter, keys names in resource bundle to check
   c) locale - optional parameter, default locale if standard not exists
   d) message - optional parameter, custom message for AssertionError.