Add commands to get and set the remote profile hash on the device
    
    - Add support for the new self-test command
    - Allow the colorhug tool to download and upload icc profiles
    - Fix up the documentation for the command line tool options
    - Install the colorhug command line tool as /usr/bin/colorhug-cmd
    - Remove colorhug-gui, it's no longer useful
    - Use CdIt8 for ccmx parsing and bump the colord dep to 0.1.20