Add new MIDIHost LowLevel demo application.

Make unfinished device mode applications use the VID/PID reserved for LUFA development devices.

LUFA/ManPages/FutureChanges.txt

@@ -22,6 +22,7 @@
   *  - Master LUFA include file rather than per-module includes
   *  - Change makefiles to allow for absolute LUFA location to be used
   *  - Abstract out the physical media from the Mass Storage device demos
+  *  - Add MIDI Host Class driver
   *  - Make new demos
   *      -# Multiple-report HID device
   *      -# Mouse/CDC Dual Class Device