scanpdf revisions and enhancements#4

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dkfurrow wants to merge 15 commits intovirantha:masterfrom

dkfurrow:master

Commits on Sep 16, 2016

Small changes to get commands working
dkfurrow
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Commits on Sep 18, 2016

Various changes: Addressed issue with inputs that caused face-up False not to be invoked, re-established test of blank_threshold value, implemented a deskew function in place of crop, changed post-…
dkfurrow
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Commits on Sep 20, 2016

Commits on Sep 21, 2016

Commits on Sep 22, 2016

documentation changes, put version to 0.4.0
dkfurrow
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