upgrade to SpringFramework 3.2.4, SpringData 1.3.0.RC1
clean up code
upgrade and clean up config

upgrade to spring security 3.2.0.RC1;
upgrade to spring data mongodb 1.3.1.RELEASE;
upgrade to spring social 1.1.0.SNAPSHOT for NewConfig branch;
clean up security config;
try new social config
refactoring account

move implementation classes to impl package
remove AccountUtils

use userIdSource bean
refactoring post

move impl classes to impl package
clean up

remove dependency of CommentPost from UserAccount
clean up config

fix UserIdSource bean circular reference issue