make the cache updating process only one, and make stats to cache

ebin/dhtcrawler.app

@@ -1,14 +1,15 @@
 {application,dhtcrawler,
              [{description,"A DHT crawler to index magnet hash to torrent"},
-              {vsn,"bb2cbfc"},
+              {vsn,"0dcf085"},
               {registered,[dht_crawler_sup]},
               {applications,[kernel,stdlib,crypto,public_key,ssl,inets,bson,
                              mongodb]},
               {mod,{crawler_app,[]}},
               {modules,[bt_conn,bt_message,crawler_app,crawler_http,
                         crawler_stats,crawler_sup,db_frontend,db_hash,
-                        db_hash_reader,db_hash_reader_sup,db_store_mongo,
-                        db_system,dht_monitor,hash_reader_stats,http_cache,
-                        http_handler,string_split,time_util,tor_download,
+                        db_hash_reader,db_hash_reader_sup,db_loc_torrent,
+                        db_store_mongo,db_system,dht_monitor,
+                        hash_reader_stats,http_cache,http_handler,loc_torrent,
+                        loc_torrent_sup,string_split,time_util,tor_download,
                         tor_download_stats,torrent_file,transfer,urldecode,
                         vlog]}]}.