public final void install(Module module) {
        modules.put(module, Elements.getElements(module));
        injector = null;
    }
This is a repository of {@link Module}s. An instance of this class is owned by the {@link ContainerBuilder}, and is
used to configure the set of Modules that eventually form the {@link Injector} of the active {@link Container}.

@author Simon Thoresen Hult
jdisc_core/src/main/java/com/yahoo/jdisc/application/GuiceRepository.java