Issue234

Added a setting  in settings.py to specify the start year for journal metadata uploads, for issues #224 and #234. Currently set to 1968, so displayed range is 1968-2015 in the selection list.
We should access the settings via the application config, rather than directly through the settings module.

So, you can do:

    start_year = app.config.get("METADATA_START_YEAR", datetime.now().year - 15)