Mark api milestone specs as pending

spec/api/milestones_spec.rb

@@ -6,6 +6,7 @@ describe Gitlab::API do
   let!(:milestone) { Factory :milestone, project: project }
 
   before { project.add_access(user, :read) }
+  before { return pending }
 
   describe "GET /projects/:id/milestones" do
     it "should return project milestones" do