Don't freak so much with no bibLevel
only derive image copies if its a tiff
Merge pull request #310 from nla/hr-nullBibLevel-error

Don't freak so much with no bibLevel
Merge pull request #311 from nla/hr-fix-jpeg

only derive image copies if its a tiff
check for tiff before deriving image copies
Merge branch 'master' into js-edit-Work-BibData