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diff --git a/vendor/drush/drush/lib/Drush/Cache/FileCache.php b/vendor/drush/drush/lib/Drush/Cache/FileCache.php
new file mode 100644
index 000000000..faacb79a8
--- /dev/null
+++ b/vendor/drush/drush/lib/Drush/Cache/FileCache.php
@@ -0,0 +1,156 @@
+<?php
+
+/**
+ * @file
+ * Definition of Drush\Cache\FileCache.
+ */
+
+namespace Drush\Cache;
+
+/**
+ * Default cache implementation.
+ *
+ * This cache implementation uses plain text files
+ * containing serialized php to store cached data. Each cache bin corresponds
+ * to a directory by the same name.
+ */
+class FileCache implements CacheInterface {
+  const EXTENSION = '.cache';
+  protected $bin;
+
+  function __construct($bin) {
+    $this->bin = $bin;
+    $this->directory = $this->cacheDirectory();
+  }
+
+   /**
+    * Returns the cache directory for the given bin.
+    *
+    * @param string $bin
+    */
+  function cacheDirectory($bin = NULL) {
+    $bin = $bin ? $bin : $this->bin;
+    return drush_directory_cache($bin);
+  }
+
+  function get($cid) {
+    $cids = array($cid);
+    $cache = $this->getMultiple($cids);
+    return reset($cache);
+  }
+
+  function getMultiple(&$cids) {
+    try {
+      $cache = array();
+      foreach ($cids as $cid) {
+        $filename = $this->getFilePath($cid);
+        if (!file_exists($filename)) throw new \Exception;
+
+        $item = $this->readFile($filename);
+        if ($item) {
+          $cache[$cid] = $item;
+        }
+      }
+      $cids = array_diff($cids, array_keys($cache));
+      return $cache;
+    }
+    catch (\Exception $e) {
+      return array();
+    }
+  }
+
+  /**
+   * Returns the contents of the given filename unserialized.
+   *
+   * @param string $filename
+   *   Absolute path to filename to read contents from.
+   */
+  function readFile($filename) {
+    $item = file_get_contents($filename);
+    return $item ? unserialize($item) : FALSE;
+  }
+
+  function set($cid, $data, $expire = DRUSH_CACHE_PERMANENT) {
+    $created = time();
+
+    $cache = new \stdClass;
+    $cache->cid = $cid;
+    $cache->data = is_object($data) ? clone $data : $data;
+    $cache->created = $created;
+    if ($expire == DRUSH_CACHE_TEMPORARY) {
+      $cache->expire = $created + 2591999;
+    }
+    // Expire time is in seconds if less than 30 days, otherwise is a timestamp.
+    elseif ($expire != DRUSH_CACHE_PERMANENT && $expire < 2592000) {
+      $cache->expire = $created + $expire;
+    }
+    else {
+      $cache->expire = $expire;
+    }
+
+    // Ensure the cache directory still exists, in case a backend process
+    // cleared the cache after the cache was initialized.
+    drush_mkdir($this->directory);
+
+    $filename = $this->getFilePath($cid);
+    return $this->writeFile($filename, $cache);
+  }
+
+  /**
+   * Serializes data and write it to the given filename.
+   *
+   * @param string $filename
+   *   Absolute path to filename to write cache data.
+   * @param $cache
+   *   Cache data to serialize and write to $filename.
+   */
+  function writeFile($filename, $cache) {
+    return file_put_contents($filename, serialize($cache));
+  }
+
+  function clear($cid = NULL, $wildcard = FALSE) {
+    $bin_dir = $this->cacheDirectory();
+    $files = array();
+    if (empty($cid)) {
+      drush_delete_dir($bin_dir, TRUE);
+    }
+    else {
+      if ($wildcard) {
+        if ($cid == '*') {
+          drush_delete_dir($bin_dir, TRUE);
+        }
+        else {
+          $matches = drush_scan_directory($bin_dir, "/^$cid/", array('.', '..'));
+          $files = $files + array_keys($matches);
+        }
+      }
+      else {
+        $files[] = $this->getFilePath($cid);
+      }
+
+      foreach ($files as $f) {
+        if (file_exists($f)) {
+          unlink($f);
+        }
+      }
+    }
+  }
+
+  function isEmpty() {
+    $files = drush_scan_directory($this->directory, "//", array('.', '..'));
+    return empty($files);
+  }
+
+  /**
+   * Converts a cache id to a full path.
+   *
+   * @param $cid
+   *   The cache ID of the data to retrieve.
+   *
+   * @return
+   *   The full path to the cache file.
+   */
+  protected function getFilePath($cid) {
+    return $this->directory . '/' . str_replace(array(':'), '.', $cid) . self::EXTENSION;
+  }
+}