Updated schema
Add json output and fix indentation
Add querying for tuners and stations
Fix indentation in logs controller
Convert scanner script to rake task
Convert scan task to use ffi-hdhomerun instead of custom scanner

By using ffi-hdhomerun, we can directly scan through ruby instead
of having to build the c program manually and requires no configuration
either. This also gives the advantage that we don't need to parse JSON,
which also means that we don't have to generate the entire JSON output
from the scan program, but can handle each channel at a time.

I also fixed issues with NET::HTTP::Request.get(). Apparently, this
doesn't return two parameters anymore?