Add Debian

Add support for Debian / Ubuntu (tested on Ubuntu 14.04 and Centos 6.5).

Artifactory provides an RPM which can be used on Redhat based distros like Centos, but Debian users just get a zip file. This Puppet module will still continue to use the RPM to install on Centos, however this Pull Request adds support for Debian too. In the case of Debian, the zip file for the specified version (defaulting to 3.3.0) will be downloaded and extracted, a user for Artifactory created and an init script placed into /etc/init.d. This will be configured to execute at startup. I think this gives equivalent functionality to what the RPM does.