Generate Debian packages

![inst](https://f.cloud.github.com/assets/182589/2299600/02a4f4d6-a0d0-11e3-960a-54f049c23458.png)

Added a tool to automatically generate .deb's for Debian (and by proxy, all derivatives, such as Ubuntu).  This is for Debian Sid, so it may take a while for the packages this is dependant upon to propagate down.  I believe Ubuntu used to handle GNURadio very differently to Debian (such as, gnuradio-fft [Ubuntu] -> libgnuradio-fft [Debian]).

Here is a .deb package generated by the script (so you may test it): https://github.com/KateAdams/gqrx/releases/download/v2.2.0/gqrx_2.2.0-93.git5be5f95_amd64.deb

I also pulled in [#csete/gqrx/152](https://github.com/csete/gqrx/pull/152) for this pull request.