Add the JBoss repositories to the <repositories> autocompletion in m2e's pom editor

Since I always find myself losing time when I need to add the JBoss repositories to a pom, I figured it might be beneficial for some developpers if the JBoss repositories were available via autocompletion in the m2e pom editor.
However, since adding repositories in a pom can be a bad practice, a warning comment should be added.
According to http://community.jboss.org/wiki/MavenGettingStarted-Users, we can add :

• The JBoss public repository (releases & snapshots) : composite repository of several major repositories.
• The JBoss artifacts repository (releases) : containing JBoss community project artifacts