Use a friendly message when Pelias has loaded

This makes the message sent to the console when Pelias is done loading
slightly friendlier.

index.js

@@ -3,5 +3,5 @@ var app = require('./app'),
     port = ( process.env.PORT || 3100 );
 
 /** run server on the default setup (single core) **/
-console.log( 'listening on ' + port );
+console.log( 'pelias is now running on port ' + port );
 app.listen( port );