Small change to use data-attribute instead of title

[lpilon]

Removed title as source for image, used data-attribute instead (default
data-photo, configurable by user).

[lorenzos]

The title attribute was not the source for the image, but the tooltip text content placed below the image (it makes sense). You didn't changed it to use data-photo instead of title, but instead of rel (and it makes sense too).

Additionally I can't get why you removed lines 47 and 48: without them the standard tooltip displayed by browsers is showed together with the one generated by the script, which is not ok. That lines where added in a53ea80 to fix #1.

[lpilon]

Indeed, you are right. Made the changes a few weeks ago and in the hurry I mixed rel and title up.

I see the reason for removing the standard tooltip. In my situation, I’m using the title-text somewhere else; it breaks because the title is empty.

Anyway, I restored it (but also to a data-attribute), and will change my own script to make them play nice.

[lorenzos]

Merged after a long time, sorry ;) I also renamed the new option and changed its default value in 6cdd451#diff-1