Added tentative view (table for tentative tasks).
Merge branch 'master' of https://github.com/cs2103aug2014-t11-1j/main into krystal

Conflicts:
	src/gui/view/TentativeView.fxml
Added star for isUrgent, made task strikethrough if done. Removed tick
Now you can interact with all views when switching. Prepping for tentativeView.
Updated star picture
Skeleton for GUI tentative view. Made changes to TentativeTask for building of tree.
Added HelperListener so HelperView can update correctly.
Fixed issue of helperview reverting back to todayview instead of tableview after adding task
Merge remote-tracking branch 'origin/krystal'