'Entry point for subclassed commands to add custom arguments.'

def add_arguments(self, parser):

    parser.add_argument(u'--modified_start', dest=u'modified_start', help=u'Starting    range    for    modified    date    (inclusive):    e.g.    "2016-08-23    16:43";    expected    in    UTC.')
    parser.add_argument(u'--modified_end', dest=u'modified_end', help=u'Ending    range    for    modified    date    (inclusive):    e.g.    "2016-12-23    16:43";    expected    in    UTC.')
