fix regression from #3968

Not ordering the IDs caused incorret ones returned

The spec is totally at the wrong level but I couldn't make
something up that exposed the bug at a deeper level :(

lib/evil_query.rb

@@ -139,11 +139,11 @@ module EvilQuery
     end
 
     def persons_private_visibilities
-      contact.share_visibilities.where(:hidden => false, :shareable_type => @class.to_s).limit(15)
+      contact.share_visibilities.where(:hidden => false, :shareable_type => @class.to_s).order("created_at DESC").limit(15)
     end
 
     def persons_public_posts
-      @person.send(table_name).where(:public => true).select(table_name + '.id').limit(15)
+      @person.send(table_name).where(:public => true).select(table_name + '.id').order("created_at DESC").limit(15)
     end
   end
 end

spec/lib/stream/person_spec.rb

@@ -9,4 +9,24 @@ describe Stream::Person do
   describe 'shared behaviors' do
     it_should_behave_like 'it is a stream'
   end
+
+  it "returns the most recent posts" do
+    posts = []
+    fetched_posts = []
+    
+    aspect = bob.aspects.first.id
+    Timecop.scale(600) do
+      16.times do |n|
+        posts << bob.post(:status_message, text: "hello#{n}", to: aspect)
+        posts << bob.post(:status_message, text: "hello#{n}", public: true)
+      end
+
+      fetched_posts = Stream::Person.new(alice, bob.person).stream_posts
+    end
+
+    posts = posts.reverse.slice(0..14)
+    fetched_posts = fetched_posts.slice(0..14)
+
+    fetched_posts.should == posts
+  end
 end