New properties for ImageFile reflecting some TIFF header info.
Merge pull request #59 from nla/imagefile_properties

New properties for ImageFile reflecting some TIFF header info.
Bug where input property was String and output was int. Created a runtime error. Fixed this so that these properties are String in and String out.
Merge pull request #60 from nla/imagefile_property_bug

Bug fix to ImageFile properties
Merge remote-tracking branch 'origin/master' into work-md