Configure a max header value instead of removing the header (see #101)

Description
-----------

This needs to hold on for the releases. Related PR's:

Library:
* FriendsOfSymfony/FOSHttpCache#424
* FriendsOfSymfony/FOSHttpCache#426

Bundle:
* FriendsOfSymfony/FOSHttpCache#426

Commits
-------

f782ecc9 Configured max header value instead of removing the header altogether
1461dd09 Use 4096 instead of 2048

Author: Toflar

src/Resources/skeleton/app/config.yml

@@ -98,3 +98,4 @@ fos_http_cache:
         enabled: true
     tags:
         enabled: true
+        max_header_value_length: 4096

src/Resources/skeleton/web/app_dev.php

@@ -78,8 +78,5 @@
 $kernel = new ContaoKernel('dev', true);
 $response = $kernel->handle($request);
 
-// Remove the X-Cache-Tags header before sending the response
-$response->headers->remove(TagHeaderFormatter::DEFAULT_HEADER_NAME);
-
 $response->send();
 $kernel->terminate($request, $response);