[PHP][Symfony] Enhancements (#6615)

* Removed commented code

* Input validation is now supported as strict JSON validation

* [PHP][Symfony] Improve the implementation
Closes #6614

* Generated code is tested to assure it compiles and updated README to dynamically load dependencies via composer

* Updated shell script because shippable tests were failing

samples/server/petstore/php-symfony/SymfonyBundle-php/SwaggerServerBundle.php

@@ -0,0 +1,50 @@
+<?php
+/**
+ * SwaggerServerBundle
+ *
+ * PHP version 5
+ *
+ * @category Class
+ * @package  Swagger\Server
+ * @author   Swagger Codegen team
+ * @link     https://github.com/swagger-api/swagger-codegen
+ */
+
+/**
+ * Swagger Petstore
+ *
+ * This is a sample server Petstore server.  You can find out more about Swagger at [http://swagger.io](http://swagger.io) or on [irc.freenode.net, #swagger](http://swagger.io/irc/).  For this sample, you can use the api key `special-key` to test the authorization filters.
+ *
+ * OpenAPI spec version: 1.0.0
+ * Contact: apiteam@swagger.io
+ * Generated by: https://github.com/swagger-api/swagger-codegen.git
+ *
+ */
+
+/**
+ * NOTE: This class is auto generated by the swagger code generator program.
+ * https://github.com/swagger-api/swagger-codegen
+ * Do not edit the class manually.
+ */
+
+namespace Swagger\Server;
+
+use Symfony\Component\HttpKernel\Bundle\Bundle;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Swagger\Server\DependencyInjection\Compiler\SwaggerServerApiPass;
+
+/**
+ * SwaggerServerBundle Class Doc Comment
+ *
+ * @category Class
+ * @package  Swagger\Server
+ * @author   Swagger Codegen team
+ * @link     https://github.com/swagger-api/swagger-codegen
+ */
+class SwaggerServerBundle extends Bundle
+{
+    public function build(ContainerBuilder $container)
+    {
+        $container->addCompilerPass(new SwaggerServerApiPass());
+    }
+}