Ed: fix build of validityPattern in gtfsParser

In gtfs the last day of a calendar must be included in the validity
period, but `boost::gregorian::period` doesn't include `end` in the
period (like an iterator). So we must add one day to the end read in the
gtfs file before creating the boost period.

http://jira.canaltp.fr/browse/NAVITIAII-1088