edited methods: isMidnight and isMidday
added methods: isEqualToTimeIgnoringDate; isEqualToDateAndTime; isSameTimeToday; isSameTimeTomorrow; isSameTimeYesterday; isMiddayToday; isMidnightToday; isMiddayTomorrow; isMidnightTomorrow; isMiddayYesterday and isMidnightYesterday
methods still needing work (commented out): isEarlierThanTime and isLaterThanTime