Revert "Prevent the build tool from bundling biblio."

This reverts commit d08efee608cf6294ea177cba12844b3d5d436165.
Revert "Remove now unnecessary support for previous-versions."

This reverts commit 7b797eb61071544ba91787d580cf81c234188ebb.
Revert "Remove previousVersion support from local biblio."

This reverts commit 872e6301f2b97d854549240aaaae37be4ee3a557.
Revert "First pass at using an API for spec references."

This reverts commit a97ac1ddaf11d560472d95207b6759ab0495b2ed.