Move capture IO into spec_helper
Add specs for Drone
Add spec for NavData#raw
Use Thread.pass to allow thread body to (possibly) run

Thread.pass is only used to improve code coverage.  The spec passes
fine without it.
Artoo compatibility: Imported Hybrid Group's video handling

Remove pave_parser.rb and tcp_vide_streamer.rb and replace with the
three video_*.rb files from the latest Hybrid Group's version of
Argus.
Ignore default logging output