Added missing format specifier for server_variables routing spec

spec/routing/rb_server_variables_routing_spec.rb

@@ -4,6 +4,7 @@ describe RbServerVariablesController do
   describe "routing" do
     it { get('/projects/project_42/server_variables.js').should route_to(:controller => 'rb_server_variables',
                                                      :action => 'show',
+                                                     :format => 'js',
                                                      :project_id => 'project_42') }
   end
 end