overwrite console.log to add extra details

log.js

 ['log', 'warn', 'error'].forEach(function(method) {
    var old = console[method];
    console[method] = function() {
      var stack = (new Error()).stack.split(/\n/);
      // Chrome includes a single "Error" line, FF doesn't.
      if (stack[0].indexOf('Error') === 0) {
        stack = stack.slice(1);
      }
      var date = new Date();
      var datetime = date.toLocaleString('en-US');
      var args = [].slice.apply(arguments).concat([stack[1].trim()]);
      args.unshift(datetime);
      return old.apply(console, args);
    };
  });