Really, really fix ls bug, with spec

lib/pry/commands/ls.rb

@@ -189,7 +189,7 @@ class Pry
         object_to_interrogate
       else
         class << object_to_interrogate
-          superclass
+          ancestors.grep(::Class).first
         end
       end
     end

spec/commands/ls_spec.rb

@@ -164,6 +164,14 @@ describe "ls" do
       autoload :McflurgleTheThird, "/tmp/this-file-d000esnat-exist.rb"
       lambda{ pry_eval("ls -c") }.should.not.raise
     end
+
+    it "should show constants for an object's class regardless of mixins" do
+      pry_eval(
+        "cd Pry.new",
+        "extend Module.new",
+        "ls -c"
+      ).should.match(/Method/)
+    end
   end
 
   describe "grep" do