added mozlog and file exists route

server/log.js

@@ -0,0 +1,15 @@
+const conf = require('./config.js');
+
+let notLocalHost =
+  conf.env === 'production' &&
+  conf.s3_bucket !== 'localhost' &&
+  conf.bitly_key !== 'localhost';
+
+const mozlog = require('mozlog') ({
+  app: 'FirefoxFileshare',
+  level: notLocalHost ? 'INFO' : 'verbose',
+  fmt: notLocalHost ? 'heka' : 'pretty',
+  debug: !notLocalHost
+})
+
+module.exports = mozlog;