Administrators get an email with links to event details, event-registration details, and invoice details when someone registers.

commit 5992d2df9cb6157543c81999c983e633df341eed
Merge: 31dca00 07f540f
Author: Eloy Zuniga Jr <eloyz.email@gmail.com>
Date:   Thu Feb 21 15:58:08 2013 -0600

    Merge branch 'refs/heads/master' into 422_send_event_reg_notif_to_admins

    Conflicts:
    	tendenci/addons/events/management/__init__.py

commit 31dca00c64cc6db3b02fbab86f0dcbe735ebb91e
Author: John Eddie Ayson <je@bixly.com>
Date:   Wed Nov 28 22:00:21 2012 +0800

    added global admin list to the reg notif recipients list, added registrant email and invoice link in email body