Generate proper URIs for books inside sub-directories.  See https://bugs.edge.launchpad.net/gnubook/+bug/397219
Generate proper URIs for books inside sub-directories.  See https://bugs.edge.launchpad.net/gnubook/+bug/397219

internetarchive/bookreader,openlibrary/bookreader,Islandora/internet_archive_bookreader,gootdude/bookreader,brisandbeans/bookreader,yankl/bookreader,garyrh/bookreader,gootdude/bookreader,niksu/bookreader,Islandora/internet_archive_bookreader,garyrh/bookreader,openlibrary/bookreader,brisandbeans/bookreader,gootdude/bookreader,niksu/bookreader,nikolas/bookreader,brisandbeans/bookreader,niksu/bookreader,brisandbeans/bookreader,gootdude/bookreader,Islandora/internet_archive_bookreader,yankl/bookreader,internetarchive/bookreader,brisandbeans/bookreader,yankl/bookreader,openlibrary/bookreader,garyrh/bookreader,niksu/bookreader,yankl/bookreader,niksu/bookreader,yankl/bookreader,nikolas/bookreader,Islandora/internet_archive_bookreader,openlibrary/bookreader,garyrh/bookreader,garyrh/bookreader,Islandora/internet_archive_bookreader,openlibrary/bookreader