Ignore me for a moment - getting ready to get into a fight with coding standards.
Bring islandora_book_batch up to snuff with islandora_batch
Merge pull request #18 from ruebot/7.x

Making the changes I made to islandora_batch work in islandora_book_batch
Add file usage to make sure it stays around.
Fix member variable usages.
Fix more messed up class member variables.
Fix another missed property.
Squash a couple warnings.
Merge pull request #20 from adam-vessey/7.x-INT-190

Add file usage to make sure it stays around.