Add custom debug.formatArgs to remove timestamp prefix in logs

Fixes #490

See also:
https://github.com/visionmedia/debug/issues/216

box.js

@@ -4,6 +4,12 @@
 
 require('supererror')({ splatchError: true });
 
+// remove timestamp from debug() based output
+require('debug').formatArgs = function formatArgs() {
+    arguments[0] = this.namespace + ' ' + arguments[0];
+    return arguments;
+};
+
 var appHealthMonitor = require('./src/apphealthmonitor.js'),
     async = require('async'),
     config = require('./src/config.js'),

janitor.js

@@ -4,6 +4,12 @@
 
 require('supererror')({ splatchError: true });
 
+// remove timestamp from debug() based output
+require('debug').formatArgs = function formatArgs() {
+    arguments[0] = this.namespace + ' ' + arguments[0];
+    return arguments;
+};
+
 var assert = require('assert'),
     debug = require('debug')('box:janitor'),
     async = require('async'),

src/apptask.js

@@ -25,6 +25,12 @@ exports = module.exports = {
 
 require('supererror')({ splatchError: true });
 
+// remove timestamp from debug() based output
+require('debug').formatArgs = function formatArgs() {
+    arguments[0] = this.namespace + ' ' + arguments[0];
+    return arguments;
+};
+
 var addons = require('./addons.js'),
     appdb = require('./appdb.js'),
     apps = require('./apps.js'),