Move theme name inflection into a method

This gives the ability to the user to overwrite it to implement his own Inflection

src/View/Helper/UrlHelper.php

@@ -153,7 +153,7 @@ public function webroot($file)
 
         if (!empty($this->theme)) {
             $file = trim($file, '/');
-            $theme = Inflector::underscore($this->theme) . '/';
+            $theme = $this->_inflectThemeName($this->theme) . '/';
 
             if (DS === '\\') {
                 $file = str_replace('/', '\\', $file);
@@ -175,6 +175,17 @@ public function webroot($file)
         return $webPath . $asset[1];
     }
 
+    /**
+     * Inflect the theme name to its underscored version.
+     *
+     * @param string $name Name of the theme which should be inflected.
+     * @return string Inflected name of the theme
+     */
+    protected function _inflectThemeName($name)
+    {
+        return Inflector::underscore($name);
+    }
+
     /**
      * Event listeners.
      *