Merge pull request #229 from cs2103aug2014-w13-1c/jin/gui

hooked up sortStyleChoiceBox's functionality
Merge pull request #230 from cs2103aug2014-w13-1c/jin/gui

Added setTitle in TitleBarViewManager for updating of the title
Revert "Can now remove date with update command"

This reverts commit c03dd8c8e3499fa3e21694049e3a31a26b9eb251.
Merge branch 'staging' of github.com:cs2103aug2014-w13-1c/main into jin/gui
Fixed sidebar button y-value