Makefile: Update for Arduino 1.0.5 and Teensyduino dependent boards (HAR...

Makefile: Update for Arduino 1.0.5 and Teensyduino dependent boards (HARDWARE_MOTHERBOARD=={8,81,82,83,84})

The AT90USB boards do not compile under the Makefile

HARDWARE_MOTHERBOARD=84 is a work-in-progress config using the Teensy++2.0 AT90USB1286 that teensylu and printrboard depend on.

This would close issue https://github.com/ErikZalm/Marlin/issues/701