Colorbox doesn't auto-recognize gallery sets

[mrclay]

I think Fancybox used the HTML rel attribute to group images, but Colorbox may require explicit rel option in its init. I don't know how we can make this automatically BC with Fancybox.

See Elgg/showcase#36

[Srokap]

Look's like it does recognize them. Rel parameter is used to override it, either to create artificial group or disable groupping.

See working example: http://jsfiddle.net/srokap/jna9E/