Issue 3747: Abuse and hidden works, sending an automatic email

Resolves issue: https://code.google.com/p/otwarchive/issues/detail?id=3747

An email is now generated when an Abuse admin Hides a Work. 
I think I disagree -- the don't send me admin emails preference was more about not sending newsletters and release notes back when we did that. This is important info about your works and account. It's automated, true, but I still think abuse should always be able to relay important info like this to users. 

Sent from my iPhone

> On Dec 24, 2014, at 5:36 PM, zz9pzza <notifications@github.com> wrote:
> 
> In app/controllers/admin/user_creations_controller.rb:
> 
> >        redirect_to(creation.ultimate_parent) 
> >      elsif creation_class == ExternalWork
> >        redirect_to(request.env["HTTP_REFERER"] || root_path)
> >      else
> > +      # Email users so they're aware of Abuse action
> > +      orphan_account = User.orphan_account
> > +      users = creation.pseuds.collect(&:user).uniq
> > +      users.each do |user|
> > +        unless user == orphan_account
> Not sure where you want to put it but should we honor the don't send me admin email preferences.admin_emails_off
> 
> —
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