add color to console.warn and console.error outputs

makeColorConsole.js

var colors = require('colors');

function makeColorConsole(fct, color){
	return function(){
		for (var i in arguments)
			if (arguments[i] instanceof Object || arguments[i] instanceof Array)
				arguments[i] = sys.inspect(arguments[i]);
		fct(Array.prototype.join.call(arguments, " ")[color]);
	};
}

console.warn = makeColorConsole(console.warn, "yellow");
console.error = makeColorConsole(console.error, "red");