Make sure utf-8 words are searchable when case doesn't match

spec/mongoid_search_spec.rb

@@ -28,6 +28,10 @@
     it "should leave utf8 characters" do
       @product._keywords.should == ["amazing", "awesome", "ole", "процессор", "процессоры", "эльбрус"]
     end
+
+    it "should return results in search when case doesn't match" do
+      Product.search("ЭЛЬБРУС").size.should == 1
+    end
   end
 
   context "when references are nil" do