Illustrator export: Layer names in `data-name` attribute

[ptgolden]

In making a diagram in the newest version of illustrator, I noticed that the layer name was not necessarily in the id attribute of the exported SVG, but rather the data-name attribute. That should be added as an option here:

dredge/src/actions.js

Line 577 in c6a6a8f

popTreatmentFromAttr('id') || popTreatmentFromAttr('name')