remove pretty much unused debug module

package.json

@@ -29,7 +29,6 @@
     "canvas": "1.1.6",
     "cookie-parser": "~1.3.3",
     "coveralls": "^2.11.2",
-    "debug": "~2.1.1",
     "express": "~4.10.6",
     "istanbul": "^0.3.2",
     "jade": "~1.8.2",

server.js

@@ -1,13 +1,13 @@
 #!/usr/bin/env node
 var config = require("./modules/config");
-var debug = require("debug")("crafatar");
+var logging = require("./modules/logging");
 var clean = require("./modules/cleaner");
 var app = require("./app");
 
 app.set("port", process.env.PORT || 3000);
 
 var server = app.listen(app.get("port"), function() {
-  debug("Crafatar server listening on port " + server.address().port);
+  logging.debug("Crafatar server listening on port " + server.address().port);
 });
 
 // cleaning worker