Updated command styles. ("ad","up","de","un","re","so","se","he","?","help")
Updated ParserTest
Added Singleton pattern to MyTasksLogic
Changed to MVC pattern
Merge branch 'master' of https://github.com/cs2103aug2014-w09-1j/main

Conflicts:
	src/mytasks/ui/MyTasksUI.java
Fixed error in HelpCommand
Added functionality to parser to support help