changes to settings/config
Image update events are now namespaced with the unique identifier of the emitter, however, this must be done manually for each event emitter. The default slot id is now set so that clicking the 'select item' menu now targets the first slot in the single workspace. Fixes #137, fixes #153.
Merge pull request #166 from IIIF/update-event-emission-to-filter-by-window#137#153

Update event emission to filter by window#137#153