Release V0.2.0

• Added messages when no file matches the --obstype value, by default is
  FOCUS [#9]
• Replaced parser.error by log.error and sys.exit when the directory does
  not exist and when exists but is empty.
• Added test for cases when the directory does not exist, when is empty and when
  no file matches the selection on --obstype which by default is FOCUS.
• Replaced logging.config.dictConfig by logging.basicConfig which fixed
  several issues. For instance --debug was unusable, and also there were
  duplicated log entries for the file handler when used as a library in other
  application. [#10]
• Replaced the use of the function get_args by using arguments on class
  instantiation instead
• Created name for modes [#11]