Merge branch 'interface'
Merge branch 'interface'
Fix javadoc in Logic.java
Remove unnecessary try/catch block in Logic.viewTask
Remove unnecessary imports in DatePair, Logic and Task
Clean up LogicTest
Merge branch 'quality_control'
Integrate JournalController to Logic to support undo/redo.

There is no working version of Delete action so was not added.
Add command distribution to undo/redo in Logic.executeCommand

Now undo/redo should work
Merge branch 'journal'
Added hasStartDate, hasEndDate to DatePair

Added hasStartDate and hasEndDate methods, refactored and remove unused
import by all classes
Added method to check if Task's dateList is empty
Merge branch 'master' of https://github.com/cs2103aug2014-w11-4j/main

Fix Conflict
Make tests in LogicTest use setUp() and tearDown()
Fix for mark command type

Wrong alias input.
Added more test cases for Parser
Merge branch 'master' into interface