I have updated the fork to support the Teensy Core. It uses a different core library as it came out before the Leonardo. The Teensy’s core uses a class usb_serial_class while the Leo uses Serial_ and the none USB devices use a class of HardwareSerial. Hence the library needs to build the corresponding Class to bind to.
I have tested that it compiles on IDE 1.0.5 with Teensy patch applied.