required config for metadata stuff in bookish
static metadata for source of books
add metadata logic to opf file model
Merge remote-tracking branch 'origin/master' into book-metadata
write metadata into nav file header
updating metadata stored in nav file
Merge branch 'master' into book-metadata
fix book metadata to use prefixed attributes
read metadata into opf model on load
Merge pull request #159 from oerpub/book-metadata

save book metadata into opf and nav files