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diff --git a/vendor/zendframework/zend-stdlib/src/StringUtils.php b/vendor/zendframework/zend-stdlib/src/StringUtils.php
new file mode 100644
index 000000000..79a22a4c0
--- /dev/null
+++ b/vendor/zendframework/zend-stdlib/src/StringUtils.php
@@ -0,0 +1,187 @@
+<?php
+/**
+ * Zend Framework (http://framework.zend.com/)
+ *
+ * @link      http://github.com/zendframework/zf2 for the canonical source repository
+ * @copyright Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
+ * @license   http://framework.zend.com/license/new-bsd New BSD License
+ */
+
+namespace Zend\Stdlib;
+
+use Zend\Stdlib\StringWrapper\StringWrapperInterface;
+
+/**
+ * Utility class for handling strings of different character encodings
+ * using available PHP extensions.
+ *
+ * Declared abstract, as we have no need for instantiation.
+ */
+abstract class StringUtils
+{
+    /**
+     * Ordered list of registered string wrapper instances
+     *
+     * @var StringWrapperInterface[]
+     */
+    protected static $wrapperRegistry = null;
+
+    /**
+     * A list of known single-byte character encodings (upper-case)
+     *
+     * @var string[]
+     */
+    protected static $singleByteEncodings = [
+        'ASCII', '7BIT', '8BIT',
+        'ISO-8859-1', 'ISO-8859-2', 'ISO-8859-3', 'ISO-8859-4', 'ISO-8859-5',
+        'ISO-8859-6', 'ISO-8859-7', 'ISO-8859-8', 'ISO-8859-9', 'ISO-8859-10',
+        'ISO-8859-11', 'ISO-8859-13', 'ISO-8859-14', 'ISO-8859-15', 'ISO-8859-16',
+        'CP-1251', 'CP-1252',
+        // TODO
+    ];
+
+    /**
+     * Is PCRE compiled with Unicode support?
+     *
+     * @var bool
+     **/
+    protected static $hasPcreUnicodeSupport = null;
+
+    /**
+     * Get registered wrapper classes
+     *
+     * @return string[]
+     */
+    public static function getRegisteredWrappers()
+    {
+        if (static::$wrapperRegistry === null) {
+            static::$wrapperRegistry = [];
+
+            if (extension_loaded('intl')) {
+                static::$wrapperRegistry[] = 'Zend\Stdlib\StringWrapper\Intl';
+            }
+
+            if (extension_loaded('mbstring')) {
+                static::$wrapperRegistry[] = 'Zend\Stdlib\StringWrapper\MbString';
+            }
+
+            if (extension_loaded('iconv')) {
+                static::$wrapperRegistry[] = 'Zend\Stdlib\StringWrapper\Iconv';
+            }
+
+            static::$wrapperRegistry[] = 'Zend\Stdlib\StringWrapper\Native';
+        }
+
+        return static::$wrapperRegistry;
+    }
+
+    /**
+     * Register a string wrapper class
+     *
+     * @param string $wrapper
+     * @return void
+     */
+    public static function registerWrapper($wrapper)
+    {
+        $wrapper = (string) $wrapper;
+        if (! in_array($wrapper, static::$wrapperRegistry, true)) {
+            static::$wrapperRegistry[] = $wrapper;
+        }
+    }
+
+    /**
+     * Unregister a string wrapper class
+     *
+     * @param string $wrapper
+     * @return void
+     */
+    public static function unregisterWrapper($wrapper)
+    {
+        $index = array_search((string) $wrapper, static::$wrapperRegistry, true);
+        if ($index !== false) {
+            unset(static::$wrapperRegistry[$index]);
+        }
+    }
+
+    /**
+     * Reset all registered wrappers so the default wrappers will be used
+     *
+     * @return void
+     */
+    public static function resetRegisteredWrappers()
+    {
+        static::$wrapperRegistry = null;
+    }
+
+    /**
+     * Get the first string wrapper supporting the given character encoding
+     * and supports to convert into the given convert encoding.
+     *
+     * @param string      $encoding        Character encoding to support
+     * @param string|null $convertEncoding OPTIONAL character encoding to convert in
+     * @return StringWrapperInterface
+     * @throws Exception\RuntimeException If no wrapper supports given character encodings
+     */
+    public static function getWrapper($encoding = 'UTF-8', $convertEncoding = null)
+    {
+        foreach (static::getRegisteredWrappers() as $wrapperClass) {
+            if ($wrapperClass::isSupported($encoding, $convertEncoding)) {
+                $wrapper = new $wrapperClass($encoding, $convertEncoding);
+                $wrapper->setEncoding($encoding, $convertEncoding);
+                return $wrapper;
+            }
+        }
+
+        throw new Exception\RuntimeException(
+            'No wrapper found supporting "' . $encoding . '"'
+            . (($convertEncoding !== null) ? ' and "' . $convertEncoding . '"' : '')
+        );
+    }
+
+    /**
+     * Get a list of all known single-byte character encodings
+     *
+     * @return string[]
+     */
+    public static function getSingleByteEncodings()
+    {
+        return static::$singleByteEncodings;
+    }
+
+    /**
+     * Check if a given encoding is a known single-byte character encoding
+     *
+     * @param string $encoding
+     * @return bool
+     */
+    public static function isSingleByteEncoding($encoding)
+    {
+        return in_array(strtoupper($encoding), static::$singleByteEncodings);
+    }
+
+    /**
+     * Check if a given string is valid UTF-8 encoded
+     *
+     * @param string $str
+     * @return bool
+     */
+    public static function isValidUtf8($str)
+    {
+        return is_string($str) && ($str === '' || preg_match('/^./su', $str) == 1);
+    }
+
+    /**
+     * Is PCRE compiled with Unicode support?
+     *
+     * @return bool
+     */
+    public static function hasPcreUnicodeSupport()
+    {
+        if (static::$hasPcreUnicodeSupport === null) {
+            ErrorHandler::start();
+            static::$hasPcreUnicodeSupport = defined('PREG_BAD_UTF8_OFFSET_ERROR') && preg_match('/\pL/u', 'a') == 1;
+            ErrorHandler::stop();
+        }
+        return static::$hasPcreUnicodeSupport;
+    }
+}