OrangutanPushbuttons (Pushbutton Interface) (OrangutanPushbuttons.h)

http://www.pololu.com/docs/0J17/5.f -- This library allows you to easily interface with the three user pushbuttons on the 3pi robot, Orangutan SV-xx8, and Orangutan LV-168 by either polling for the state of specific buttons or by waiting for press/release events on specifiable buttons. The waitFor____() methods in this library automatically take care of button debouncing. You do not need to initialize your OrangutanPushbuttons object before use. All initialization is performed automatically when needed. All of the methods in this class are static; you should never have more than one instance of an OrangutanPushbuttons object in your sketch.