Spine generation for OPF file.
Spine generation for OPF file.

oreillymedia/HTMLBook,macmillanpublishers/HTMLBook,oreillymedia/HTMLBook,gitenberg-dev/HTMLBook,oreillymedia/HTMLBook,gitenberg-dev/HTMLBook,mushroomgithub/HTMLBook,wastemobile/HTMLBook,wastemobile/HTMLBook,mushroomgithub/HTMLBook,mushroomgithub/HTMLBook,gitenberg-dev/HTMLBook,macmillanpublishers/HTMLBook,macmillanpublishers/HTMLBook