Rename server file

Procfile

@@ -1 +1 @@
-web: node src/bin/www
+web: node src/bin/www.js

src/bin/www.js

@@ -16,7 +16,6 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#!/usr/bin/env node
 'use strict';
 require('dotenv').config({silent: true});
 var throng = require('throng');