[Console] OutputFormatter: move strtolower to createStyleFromString

While playing with the href feature that'll be available in 4.3,
I spotted href value is lowercased. Which I guess could be an issue
on case-sensitive filesystems.
This changes nothing for the current branch, but will allow when merging
to upper branches to fix the behavior described above, hence keep original case.

src/Symfony/Component/Console/Formatter/OutputFormatter.php

@@ -157,7 +157,7 @@ public function format($message)
             if (!$open && !$tag) {
                 // </>
                 $this->styleStack->pop();
-            } elseif (false === $style = $this->createStyleFromString(strtolower($tag))) {
+            } elseif (false === $style = $this->createStyleFromString($tag)) {
                 $output .= $this->applyCurrentStyle($text);
             } elseif ($open) {
                 $this->styleStack->push($style);
@@ -203,13 +203,14 @@ private function createStyleFromString($string)
         $style = new OutputFormatterStyle();
         foreach ($matches as $match) {
             array_shift($match);
+            $match[0] = strtolower($match[0]);
 
             if ('fg' == $match[0]) {
-                $style->setForeground($match[1]);
+                $style->setForeground(strtolower($match[1]));
             } elseif ('bg' == $match[0]) {
-                $style->setBackground($match[1]);
+                $style->setBackground(strtolower($match[1]));
             } elseif ('options' === $match[0]) {
-                preg_match_all('([^,;]+)', $match[1], $options);
+                preg_match_all('([^,;]+)', strtolower($match[1]), $options);
                 $options = array_shift($options);
                 foreach ($options as $option) {
                     try {