code: public Governator addOverrideModules(Module ... modules) {
          if (modules != null) {
              this.overrideModules.addAll(Arrays.asList(modules));
          }
          return this;
      }
docs: Add override modules for any modules add via addModules or that are
  conditionally loaded.  This is useful for testing or when an application
  absolutely needs to override a binding to fix a binding problem in the
  code modules
  @param modules Modules that will be applied as overrides to modules
  @return this