On the top right one can see the source or graphite url.
While i think it is a nice feature, i would like to be able to disable it contains a private API key.

So far here is what i think needs to be done to enable that feature:

I though about a boolean set in the config:
https://gist.github.com/kyzh/5507659#file-gdash-yaml-L12

Ensure that the parameter get a default value
https://gist.github.com/kyzh/5507714#file-sinatra_app-rb-L34

Pass the variable to the erb template like so:
https://gist.github.com/kyzh/5508055#file-sinatra_app-rb-L2
( https://github.com/ripienaar/gdash/blob/master/lib/gdash/sinatra_app.rb#L234 )

Then display the source URL if graphite_url_displayed is set to true:
https://gist.github.com/kyzh/5507792#file-dashboard-erb-L8

Is is a good/bad idea? Is it the right way to go about it?
I would be keen to have your feedback on it

Note: It all done in my browser, so it is not tested yet whatsoever.