Added support for ArduinoISP
Added support for ArduinoISP for avrdude. The avrdude patch adds into avrdude.conf the ArduinoISP programmer with the correct VID and PID.

Created libusb.build.bash that downloads libusb sources and builds them. Libusb is required in order to use ArduinoISP with avrdude, using a local copy of libusb removes the dependency from libraries installed on the system.

The script avrdude.build.bash now renames avrdude into avrdude_bin after the build and creates a script avrdude that launches avrdude_bin with the correct library path.

Edited Readme.md: added some missing packages required to build avrdude on Linux.
Merge pull request #14 from sngl/atmel-3.4.3

Added support for ArduinoISP