Switch to ASCII-char for marking selected plugins
Release 0.4.2
moved usb-specific code down to the device plugins that actually use it
Maybe we want to fully initialize the driver class instead, then yield that?
Set core logging level to DEBUG
confit: Allow dumping of configuration without default configuration
loaded
Fix number of removed images with capture(retake=True)
web: Return complete workflow objects when enumerating all workflows
web: Numerous changes in server code
    - Workflow objects are automatically fetched from the database and
      passed to the view function via the custom 'workflow' converter
      for routes
    - Plugin configuration templates are global for the whole
      application, the client can cherry-pick the ones he actually needs
    - The global configuration can be obtained via GET '/config'
    - Workflow IDs are for convience stored on the objects themselves
    - Workflows can be updated via PUT '/workflow/:id', this will for
      now only update the configuration
    - Workflows can be removed via DELETE '/workflow/:id', this will
      purge them from the database and filesystem
    - The '/workflow/:id/poll' endpoint now times out after 30 seconds.
      This was done, as the wsgiref server does not have set a timeout on
      its sockets and thus, if the client times out first, we're left
      with an increasing number of permantenly open sockets, which would
      eventually crash the application and bring the whole system to a
      halt.
    - Workflows can be downloaded as a ZIP archive via GET
      '/workflow/:id/download'
    - Image thumbnails are now cached on a temporary directory, which is
      removed after the application shuts down.
web: Initial version of clientside app with Backbone, React and
Foundation
    - List all workflows
    - CRD for individual workflows
    - Capture interface
    - Download ZIP of individual workflows
Some packaging fixes
Allow configuration without postprocessing plugins in 'configure'.
Refactor #38; Fix formatting
web: Docstrings for API
web: Use flags to specify mode, not subcommands
Update tutorial.rst

Add djvulibre-bin dependency for djvubind to list of packages to be apt-get installed.
Merge pull request #41 from markvdb/patch-2

docs: Add djvulibre-bin dependency for djvubind to package list in tutorial
web: Run server in production mode, using 'waitress' by default

Debugging mode can be activated via a command-line switch
Fix boolean bug that inverted the 'parallel_capture' option
web: JavaScript formatting