Doc: fix typo in cli documentation
Dummy device: model single device operation

Add a configuration option 'single' to the template for the dummy device.
When this is set to 'yes', yield a single device rather than an odd/even
pair.
Merge pull request #143 from gareth8118/single_camera

Dummy device: model single device operation
Merge pull request #142 from gareth8118/doc-updates

Doc: fix typo in cli documentation
Docstrings for spreads.tkconfigure
Some more PEP8 fixes
Docstrings and more comments for spreads.workflow
Add PEP8 check to Travis configuration
autorotate: Add docstrings
djvubind: Add docstrings
hidtrigger: Add docstrings
intervaltrigger: Docstrings
pdfbeads: docstrings
scantailor: docstrings and comments
tesseract: docstrings and comments
PEP8 fixes
Fix gui tests
More PEP8 fixes