Flickr link is broken by max_width setting

[agger-magenta]

Embedding from Flickr works by using Flickr's shortlinks, e.g. http://flic.kr/p/kmL36Y.

However, if I specify the max_width setting on the Advanced tab when editing the Embed.ly link, max_width is added as a parameter to the Flickr URL, yielding this "Oops!": https://secure.flickr.com/photo.gne?short=kmL36Y?max_width=500

I.e., apparently "max_width" is not used in Flickr's API. Maybe the plugin should be modified to only modify what's output into Plone in these cases?