add admin page for password policy screens

add past password class that keeps track of a users past passwords an… …

…d compares it to the password they are trying to set

add login password policy logic

prevent users from logging in if their password is expired

register daily cron event to notify all users who qualify for an soon… …

… to be expired password

fix email message and add deactivation cleanup code

fix email notification logic and add the ability to include dynamic t… …

…ext in the reminder email

update reminder date logic so that emails get sent out to users how p… …

…assoword expire in x days

add constant to disable password policy functionality

update readme file

fix typo

remove extra space

update constant name

add additional checks to make sure our password policy setting are at… …

… least greater than one day

fix expire description

rollback version