Add javascript tracker and give Blocmetrics the capability to receive and record events from the js tracker.

It doesn’t work without options. I don’t yet fully understand why. 

On Jul 25, 2014, at 2:46 AM, Oliver Azevedo Barnes <notifications@github.com> wrote:

> In app/controllers/events_controller.rb:
> 
> > @@ -1,8 +1,16 @@
> >  class EventsController < ActionController::Base
> >    respond_to :json
> > +  before_filter :cors_set_headers
> > +  after_filter :cors_set_access_control_headers
> > +
> > +  def options
> What's the options action for?
> 
> —
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