first add core init code
add context
add context and holder
add session control logic
add new security arch
fix #1 better session api
fix #2 simplify userdetail with new account concept
add realm support
add anthentication strategy
add ldap realm support
fix #3 provider realm parent relation
add ldap main function
add web module
enhance security filter
merge SecurityContext and Holder
fix security filter support concurrent access
add web preauth
add details
add cas
add default login logic and add registry return value