Update gem reference to celluloid 0.15.0.pre
Needed to handle restarting Celluloid actors
Better structure for adaptor and driver requires
Cannot refer to constant until serialport is required
Set the level for logging to INFO or above
Correction for listing device paths
Update celluloid to 0.15.0.pre2
Newer celluloid is less chatty unless CELLULOID_DEBUG
Merge pull request #39 from hybridgroup/celluloid-0.15.0.pre

Celluloid 0.15.0.pre