Reverses application of styles, now left-to-right

The styles' application order used to to be right-to-left e.g.:
```javascript
console.log(chalk.red.reset.blue('something'))
// red
```

Where now it has been reversed. E.g.:
```javascript
console.log(chalk.red.reset.blue('something'))
// blue
```

It seems to me that this is the more intuitive application order.

Closes #41

index.js

@@ -57,7 +57,8 @@ function applyStyle() {
 	/*jshint validthis: true*/
 	var nestedStyles = this._styles;
 
-	for (var i = 0; i < nestedStyles.length; i++) {
+	var i = nestedStyles.length;
+	while (i--) {
 		var code = ansiStyles[nestedStyles[i]];
 		// Replace any instances already present with a re-opening code
 		// otherwise only the part of the string until said closing code