Handly AppleScripts to manage OS X notifications. (Use in Automator, bind to keyboard shortcuts via BetterTouchTool, etc.) Inspired by http://apple.stackexchange.com/a/155736

notification-actions.applescript

my closeNotifications()
on closeNotifications()
	
	tell application "System Events"
		tell process "Notification Center"
			set theWindows to every window
			repeat with i from 1 to number of items in theWindows
				set this_item to item i of theWindows
				try
					click button 1 of this_item
				on error
					my closeNotifications()
				end try
			end repeat
		end tell
	end tell
end closeNotifications