appnames are not unique

[bahamas10]

the appname should be unique per install, and stored in the config json

[mattbucci]

should this be unique per machine ie 'hue-cli#hostname' as in the docs or per install? I wrote a little bit of code that just does try json eval {appName = config.appName} else { appName = 'hue-cli#' + os.hostname() } I could merge