add purge_complete type

parser.py

@@ -112,6 +112,7 @@ post_data('event', {'type': 'start'}, 1)
 start = time()
 sources = db().sources()
 db().purge_error()
+post_data('event', {'type': 'purge_complete'}, 1)
 pool = Pool(processes=4)
 ret = pool.map(parseSource, sources)
 new = sum([r[3] for r in ret])