code: function()
  			{
  				var func = todo.shift();
  				if (!func)
  				{
  					// all done!
  					if (callback) callback(false);
  					return;
  				}
  
  				if (token_fetch.indexOf(func.func) >= 0)
  				{
  					// if we're actually calling a token fetch function, skip!
  					process.nextTick(step);
  				}
  				else
  				{
  					func.func(function(error) {
  						if (error)
  						{
  							// token fetching error!
  							if (callback) callback(func.name + " :: " + error);
  							return;
  						}
  
  						// do next step
  						process.nextTick(step);
  					});
  				}
  			}
docs: work through our list of tokens we need to update