Send single group email.

Changed the email action to send 1 email to everyone instead of individual emails to each person.  The email recipients are included in the bcc line to prevent mass replies.
Also, fixed unit test issues.

Change-Id: I34a8e62e06943df231884f88706f60b6552772e0
Add ability for admin to send out emails to all users on the website.  Added checkbox on the user settings page to allow users to unsubscribe from admin emails.

Change-Id: Ibd015ea4a9d3e8ffe5af7a58bba8a850e4e0c4c5