Pswadi/google login restrictions

Describe your PR

/cc @zendesk/samson 

### References
 - Jira link:

### Risks
 - None
hmmm.... I don't remember why I added that. Will remove it.


On Wed, Aug 27, 2014 at 8:57 PM, Jason Smale <notifications@github.com>
wrote:

> In app/controllers/sessions_controller.rb:
>
> > @@ -33,10 +34,30 @@ def destroy
> >
> >    protected
> >
> > +  def show_login_restriction
> > +    logout!
> > +
> > +    flash[:error] = "Only #{restricted_email_domain} users are allowed to login"
> > +    render :new
> > +    return false
>
> Why do you need to return false here?
>
> —
> Reply to this email directly or view it on GitHub
> <https://github.com/zendesk/samson/pull/71/files#r16819531>.
>