starting book content model
Merge branch 'master' of github.com:FLVC/offline-ingest
Don't over-write a mets .orig file
handle the case where digitool uses CDATA for a filename in a digital_entityxml file, when fixing the METSID-XX issue
prune chapters introduced by unnecessary divs
ingest a digitool mets book,  just the parent object (toc, original DT mets, first page thumbnail, mods and dc)
add a util to unescape an escaped XML string
small comment/whitespace changes