Added language support.
Version 0.6
Update get_expire_date_display() to allow passing or arguments.
Add links to GitHub, documentation and settings.
Remove closing PHP tags at end of files.
Remove unused variables in Expire_User_Admin_Plugin class.
Add Help tab.
Add option to remove user expiry details and continue to allow user to login when they expire.
Add help to edit user page and help sidebar to settings page.
Use current_time( 'timestamp' ) instead of time().

Use site's local timezone.
Use date formats from WordPress settings.
Use user's real name in notification emails if available.
Ensure custom roles are listed in drop down menu.
Version 0.7
Adhere to WordPress code standards using {}.
Tested up to WordPress 3.9
Added [expire_users_current_user_expire_date /] shortcode.
Add new WordPress.org banner image and artwork file.
Expire_User->maybe_expire() should return true if user is expired.
Force check if user expired on login.