update sae_db.py
update the models and factory
modularize the project structure
add makesql.py for build sql statement
add sae's index.wsgi, update makesql (select query)
add comment and cache module in base
update the SAE/db_base.py and makesql.py
update files
add base class of models
update the property of the db model
finish dbProperty's prototype design
bugfixed: some indent or mistake in code
update the handlers
update the handler
add default value and fix some mistake in code
Merge branch 'sae_version' of github.com:drzunny/memprez into sae_version

Conflicts:
	blog/handlers/artlist.py
	blog/handlers/comment.py
	blog/handlers/postboard.py
update the fields in model
Merge branch 'sae_version' of github.com:drzunny/memprez into sae_version
update handler
update the handlers, add template file and friendlink plugin