Updated travis.yml to fix issu #2

Added debconf envirment variable to tell that he should install the package version and don't prompt with -y the fail was -y only works if there is a standart answer defined in the package and config overwrites are never handled in a package only internal configs but never user edited once in future you should maybe implament a switch for using old or auto upgrade

have a nice day :D
frank-dspeed travis fix