added untappd field to signup, verification check for valid username
fixing differnece between existence of fs.existSync for older versions of node
validation with prompts and additonal lookup
this is broken checkin, adds untappd_beer_id and tries to pull it
got untappd data for kegs working based on untappd_beer_id, I doubt it is in the right place and needs to move, but all the UI still seems to be run off the keg_io server executable