Added IP calculation and display on dendro server bootup

Added condition for calculating the b2drop address

package.json

@@ -96,6 +96,7 @@
     "humanize": "0.0.9",
     "identicon.js": "^2.3.1",
     "install": "^0.10.2",
+    "ip": "^1.1.5",
     "it-optional": "^0.1.0",
     "jdbc": "^0.6.0",
     "jsdom": "^11.3.0",

src/bootup/init/start_server.js

@@ -24,7 +24,8 @@ const startServer = function (app, server, callback)
 
     server.listen(app.get("port"), function ()
     {
-        Logger.log_boot_message("Dendro server listening on port " + app.get("port"));
+        var ip = require("ip");
+        Logger.log_boot_message("Dendro server listening on " + ip.address() + ":" + app.get("port"));
         callback(null);
     });
 };

src/kb/storage/storageB2Drop.js

@@ -37,7 +37,17 @@ class StorageB2Drop extends Storage
     _getB2DropPath (file)
     {
         const self = this;
-        return self.prefix + file.ddr.humanReadableURI;
+        if (typeof file === "string")
+        {
+            return self.prefix + file;
+        }
+        else if (file instanceof Object && !isNull(file.ddr))
+        {
+            return self.prefix + file.ddr.humanReadableURI;
+        }
+
+        Logger.log("error", "Unable to determine the B2drop path uri of resource " + self.uri);
+        return null;
     }
 
     open (callback)