this is for autocomplete textfield
added Junit test for logicFacade
added more test cases in the Junit test for LogicFacade
modified test cases for teststorage and testModelTasktosavestring
1.refactored the Reminder code in MainApp.
2.removed redundant code in editlistener
3.refactored reminder to a TimeService class. This class can be used to implement other future time service.
Added initial JUnit test for CommandExecutor.
Merge remote-tracking branch 'origin/yongkai'