Include composer dependencies in repo

vendor/zendframework/zendxml/README.md

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+ZendXml
+=======
+
+An utility component for XML usage and best practices in PHP
+
+Installation
+------------
+
+You can install using:
+
+```
+curl -s https://getcomposer.org/installer | php
+php composer.phar install
+```
+
+Notice that this library doesn't have any external dependencies, the usage of composer is for autoloading and standard purpose. 
+
+
+ZendXml\Security
+----------------
+
+This is a security component to prevent [XML eXternal Entity](https://www.owasp.org/index.php/XML_External_Entity_%28XXE%29_Processing) (XXE) and [XML Entity Expansion](http://projects.webappsec.org/w/page/13247002/XML%20Entity%20Expansion) (XEE) attacks on XML documents.
+
+The XXE attack is prevented disabling the load of external entities in the libxml library used by PHP, using the function [libxml_disable_entity_loader](http://www.php.net/manual/en/function.libxml-disable-entity-loader.php).
+
+The XEE attack is prevented looking inside the XML document for ENTITY usage. If the XML document uses ENTITY the library throw an Exception.
+
+We have two static methods to scan and load XML document from a string (scan) and from a file (scanFile). You can decide to get a SimpleXMLElement or DOMDocument as result, using the following use cases:
+
+```php
+use ZendXml\Security as XmlSecurity;
+
+$xml = <<<XML
+<?xml version="1.0"?>
+<results>
+    <result>test</result>
+</results>
+XML;
+
+// SimpleXML use case
+$simplexml = XmlSecurity::scan($xml);
+printf ("SimpleXMLElement: %s\n", ($simplexml instanceof \SimpleXMLElement) ? 'yes' : 'no');
+
+// DOMDocument use case
+$dom = new \DOMDocument('1.0');
+$dom = XmlSecurity::scan($xml, $dom);
+printf ("DOMDocument: %s\n", ($dom instanceof \DOMDocument) ? 'yes' : 'no');
+```
+
+