add debian/rpm support

[He-Pin]

By using the sbt-native-packager,we could package it as a service,I think that would be great to use.
btw,is there anychange to extract the download provider,like using axel or aria2c to download the aritifcaty?

thanks.

[jilen]

@Centaur I think I could do this. Because I use sbt-native-packager heavily in our private play projects