Marker not set when file skipped

[LewisW]

The marker isn't set when an image is skipped. What's the reason for this? The reason I ask is: I think we've got the scenario where listKeyPage returns an entire set of keys that are all skipped - but because the marker is never updated on skip, it just keeps retrying the same page over an over again.

Are their any negative side-affects of still setting the marker when a file is skipped?

[emersonbroga]

I think it makes sense to add the skipped ones to the marker file.

PR Created: #9

[auscaster]

Fixed via PR