fixing nodejs with correct version, update example

Need to use a manage_repo and the correct version of the nodejs.
Disable admin user by default.

When users remained undef, just no add it to the settings.json.
This is a better approach then configure a user.
Disable git installation, replace with a deb package

For a clean way of installation a Debian package was created.
This will be used to deploy it. For the moment the repository
will be place by hand.
Enable test repo
Enable public repo
Merge branch 'better-installation'