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?
Refactor #38; Fix formatting
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
Merge branch 'master' into webplugin
Add logging to file; Make core options use PluginOption as well
Warn when one of the devices disappears; Try to obtain new devices on
next action
Add 'finish_capture' method to device API

chdkcamera switches to 'play' mode on finish_capture now
web: Stream workflow ZIP instead of going through a temporary file
web: Try to get thumbnails from EXIF data, fall back to scaling if
pyexiv2 not installed
web: Logging in 'persistence'
web: Poll for all changes in one request
web: Polling returns warning and error messages; Will be displayed in UI