Fully implement parse function for the first time in UpdateParser and it is ready for testing. Fully implement UpdateHandler class, created getTask, updateStartDate, updateStartTime, updateEndDate, updateEndTime, updateReminder, updateCompleted and getSucccessMessage functions to support the class. updateReminder function remains unimplemented.
Merge branch 'master' of https://github.com/cs2103aug2014-T13-2J/main