added session for user login

added view login.php
added method for login display
added button for login
not tested.
can continue to login form

changed formfields
added password, password is not shown when typing
does not connect to database == no model atm
error checking semi working

added users model, also autoloaded,
added tryagain method for if id/password is wrong...semi working
error checking working
added success view

added success view if was able to login as well as logout button,
cannot login...
sync

sync
Merge pull request #2 from sharonpvs/n

N