WIP on scan command.
Fix bugs and updated feedback messages.
WIP on commands changes.
Removed tmp linux commands example file.
Removed scan command from commands list.
Added new pari, unpair, connect-to-serial commands and updated standard IO pipes when executing interacting commands.
Updated scan serial commands and connect-to-serial description.
Updated commands to connect serial and bluetooth pair|unpair. Also updated connect serial child process to inherit stdio pipes.
Change all connect, pair and unpair as bluetooth subcommands.
Merge pull request #85 from hybridgroup/120-scan-cmd

Added scan command to cylon.