Added visibility setters for sort controls in TitleBarViewManager
Merge pull request #246 from cs2103aug2014-w13-1c/jin/gui

Added visibility setters for sort controls in TitleBarViewManager
Added undone keyword for display
Added "begin" and "from" keywords for start date
Merge branch 'staging' into ryan/controller
Collate tool support for model. concatSlash() in FileStorage now.
Merge pull request #247 from cs2103aug2014-w13-1c/ryan/controller

Added more keywords (for display and start date)
Merge branch 'staging' of https://github.com/cs2103aug2014-w13-1c/main into staging
fixed search by date methods in taskcontroller
Merge branch 'staging' of https://github.com/cs2103aug2014-w13-1c/main into jolly/gui