add exif extension

composer.json

@@ -13,6 +13,7 @@
         "ext-mbstring": "*",
         "ext-xml": "*",
         "ext-curl": "*",
+        "ext-exif": "*",
         "doctrine/dbal": "2.*",
         "slim/slim": "2.6.2",
         "mtdowling/cron-expression": "1.0.*",

install/core/config.php

@@ -46,6 +46,7 @@ return array(
             'mbstring',
             'curl',
             'xml',
+            'exif',
             'max_execution_time' => 180,
             'max_input_time' => 180,
             'memory_limit' => '256M',