moving setting the background to ros_user role
adding default monospace-font to default ros_user
using variables for the background
checking dest folder is not empty
Doc update
using basename for getting only filename from ros_user_background
Merge pull request #43 from shadow-robot/F_background_to_ros_user

Fixes #40 - Move background and font setting to ros_user role.
slightly circonvoluted way of setting the ros packages names and installing them
Merge pull request #44 from shadow-robot/F_install_ros_pkg

Fixes #39 - Add ros_packages to ros_install role.
Merge branch 'master' into F_glassbot

Conflicts:
	ansible/vagrant_site.yml