Need to support 1.8.6 on this branch, remove the tap

lib/mongoid/associations/embeds_many.rb

@@ -56,7 +56,7 @@ def clear
       # The newly created Document.
       def create(attrs = {}, type = nil)
         document = build(attrs, type)
-        document.tap(&:save)
+        document.save; document
       end
 
       # Creates a new Document and adds it to the association collection. The