Unique spec node names for Document#each_node.
Unique spec node names for Document#each_node.

This makes it a little bit easier to see if the order is actually correct.

YorickPeterse/oga,ttasanen/oga,dfockler/oga,dfockler/oga,dfockler/oga,jeffreybaird/oga,altmetric/oga,altmetric/oga,altmetric/oga,jeffreybaird/oga,YorickPeterse/oga,dfockler/oga,YorickPeterse/oga,jeffreybaird/oga,ttasanen/oga,jeffreybaird/oga,ttasanen/oga,altmetric/oga,altmetric/oga,ttasanen/oga,ttasanen/oga,dfockler/oga,YorickPeterse/oga,YorickPeterse/oga,jeffreybaird/oga