'Called once when calibre plugins are initialized.  Plugins are
re-initialized every time a new plugin is added. Also note that if the
plugin is run in a worker process, such as for adding books, then the
plugin will be initialized for every new worker process.
Perform any plugin specific initialization here, such as extracting
resources from the plugin ZIP file. The path to the ZIP file is
available as ``self.plugin_path``.
Note that ``self.site_customization`` is **not** available at this point.'

def initialize(self):

    pass
