support for iBuddy Device

This patch adds support for USB iBuddy devices (http://www.i-buddy.com/). It was tested on Ubuntu 13.10.

To make use of the iBuddy device the following requirements have to be satisfied:
- python-usb library needs to be installed
- udev rules that allow non-root user to access the device are needed. (The example assumes the user as a member of group 'plugdev'):

SUBSYSTEMS=="usb", ATTRS{idVendor}=="1130", ATTRS{idProduct}=="0002", SYMLINK+="sub20", GROUP="plugdev", MODE="660"