Rename 'userDetail' to 'userDetails';
rename 'itemComments' to 'itemComment';
take apart struts.xml into several xml files.
Merge branch 'zhang' of
https://github.com/BIT-TaoXue/TaoXue-WebServer.git into zhang

Conflicts:
	src/com/tx/model/UserDetail.hbm.xml
	src/com/tx/model/UserDetail.java