a script to install uhd gnuradio

http://gnuradio.org/redmine/wiki/gnuradio/BuildGuide#Build-Script-for-Ubuntu-and-Fedora

http://www.sbrac.org/files/build-gnuradio

The address to download most recent images (http://www.ettus.com/downloads/uhd_images/UHD-images-most-recent/) was broken at the time I run it. Changed it to http://www.ettus.com/downloads/uhd_releases/003_000_001/images-only/UHD-images-003.000.001.tar.gz