[FEATURE] Append timestamp to not merged css and js

Now js and css files will have timestamp appended even if they are not
bundled into one file.

This change also adds timestamp to files included directly in the template
e.g.
<script type="text/javascript"
	src="<?php echo $this->getSkinUrl('js/jquery.js'); ?>"></script>

app/code/local/Aoe/JsCssTstamp/Model/Package.php

@@ -307,7 +307,6 @@ protected function _prepareUrl($uri)
         }
 
         if ($this->addTstampToAssets) {
-            Mage::log('Aoe_JsCssTsamp: ' . $uri);
             $matches = array();
             if (preg_match('/(.*)\.(gif|png|jpg)$/i', $uri, $matches)) {
                 $uri = $matches[1] . '.' . $this->getVersionKey() . '.' . $matches[2];
@@ -316,4 +315,40 @@ protected function _prepareUrl($uri)
 
         return $uri;
     }
+
+    /**
+     * Get skin file url
+     *
+     * @param string $file
+     * @param array $params
+     * @return string
+     */
+    public function getSkinUrl($file = null, array $params = array())
+    {
+        Varien_Profiler::start(__METHOD__);
+        if (empty($params['_type'])) {
+            $params['_type'] = 'skin';
+        }
+        if (empty($params['_default'])) {
+            $params['_default'] = false;
+        }
+        $this->updateParamDefaults($params);
+        if (!empty($file)) {
+            $result = $this->_fallback($file, $params, array(
+                array(),
+                array('_theme' => $this->getFallbackTheme()),
+                array('_theme' => self::DEFAULT_THEME),
+            ));
+        }
+        $result = $this->getSkinBaseUrl($params) . (empty($file) ? '' : $file);
+        Varien_Profiler::stop(__METHOD__);
+
+        if ($this->addTstampToAssets) {
+            $matches = array();
+            if (preg_match('/(.*)\.(css|js)$/i', $result, $matches)) {
+                $result = $matches[1] . '.' . $this->getVersionKey() . '.' . $matches[2];
+            }
+        }
+        return $result;
+    }
 }