Update deps

Changelogs summary:

 - twig/twig updated from v1.22.3 to v1.23.0
   See changes: https://github.com/twigphp/Twig/compare/v1.22.3...v1.23.0
   Release notes: https://github.com/twigphp/Twig/releases/tag/v1.23.0

 - doctrine/cache updated from v1.4.2 to v1.5.0
   See changes: https://github.com/doctrine/cache/compare/v1.4.2...v1.5.0
   Release notes: https://github.com/doctrine/cache/releases/tag/v1.5.0

 - symfony/symfony updated from v2.7.5 to v2.7.6
   See changes: https://github.com/symfony/symfony/compare/v2.7.5...v2.7.6
   Release notes: https://github.com/symfony/symfony/releases/tag/v2.7.6

 - sensio/distribution-bundle updated from v3.0.31 to v3.0.33
   See changes: https://github.com/sensiolabs/SensioDistributionBundle/compare/v3.0.31...v3.0.33
   Release notes: https://github.com/sensiolabs/SensioDistributionBundle/releases/tag/v3.0.33

 - nelmio/api-doc-bundle updated from 2.9.0 to 2.10.3
   See changes: https://github.com/nelmio/NelmioApiDocBundle/compare/2.9.0...2.10.3
   Release notes: https://github.com/nelmio/NelmioApiDocBundle/releases/tag/2.10.3

 - lexik/form-filter-bundle updated from v4.0.1 to v4.0.2
   See changes: https://github.com/lexik/LexikFormFilterBundle/compare/v4.0.1...v4.0.2
   Release notes: https://github.com/lexik/LexikFormFilterBundle/releases/tag/v4.0.2

 - j0k3r/graby-site-config updated from 1.0.5 to 1.0.6
   See changes: https://github.com/j0k3r/graby-site-config/compare/1.0.5...1.0.6
   Release notes: https://github.com/j0k3r/graby-site-config/releases/tag/1.0.6

 - j0k3r/graby updated from 1.0.2 to 1.0.4
   See changes: https://github.com/j0k3r/graby/compare/1.0.2...1.0.4
   Release notes: https://github.com/j0k3r/graby/releases/tag/1.0.4

 - phpunit/phpunit updated from 4.8.13 to 4.8.16
   See changes: https://github.com/sebastianbergmann/phpunit/compare/4.8.13...4.8.16
   Release notes: https://github.com/sebastianbergmann/phpunit/releases/tag/4.8.16

1 files changed, 8 insertions, 2 deletions

diff --git a/app/SymfonyRequirements.php b/app/SymfonyRequirements.php
index abaf0c17..28b0dcdb 100644
--- a/app/SymfonyRequirements.php
+++ b/app/SymfonyRequirements.php
@@ -447,6 +447,12 @@ class SymfonyRequirements extends RequirementCollection
         }
 
         $this->addRequirement(
+            function_exists('iconv'),
+            'iconv() must be available',
+            'Install and enable the <strong>iconv</strong> extension.'
+        );
+
+        $this->addRequirement(
             function_exists('json_encode'),
             'json_encode() must be available',
             'Install and enable the <strong>JSON</strong> extension.'
@@ -546,10 +552,10 @@ class SymfonyRequirements extends RequirementCollection
             require_once __DIR__.'/../vendor/autoload.php';
 
             try {
-                $r = new \ReflectionClass('Sensio\Bundle\DistributionBundle\SensioDistributionBundle');
+                $r = new ReflectionClass('Sensio\Bundle\DistributionBundle\SensioDistributionBundle');
 
                 $contents = file_get_contents(dirname($r->getFileName()).'/Resources/skeleton/app/SymfonyRequirements.php');
-            } catch (\ReflectionException $e) {
+            } catch (ReflectionException $e) {
                 $contents = '';
             }
             $this->addRecommendation(