Removed search storedTasksByPriority in searchManager since it is the
same as storedTasksByTime
Added undo support for uncmi and unticked command
Modified the return type of undo/redo to String

to show if the operation is carried out successfully
add in indication for priority, can display very long tasks
Merge branch 'UI'
Merge pull request #91 from cs2103aug2014-w15-3J/Logic

Merge Logic with Master
Merge branch 'parser'