Updates to Members Page

[Glen Mazza]

-- Only admins may edit & save, add/remove people
-- Update text for above on members page.
-- Invitation email gone, pending status gone.
-- New flag for user-specific email notifications
-- Checkbox to turn on/off emails on menu page, disabled if no emails being sent (remove from weblog config?)
-- Ability to shut off notifications via clicking on email
-- CSS via Bootstrap.