Make panel data binary values.

postgres gets really sad when you put null bytes into character columns.
With this change new schema will use binary columns which work fine in
postgres.

src/Model/Entity/Panel.php

@@ -25,4 +25,20 @@ class Panel extends Entity
      * @var array
      */
     protected $_hidden = ['content'];
+
+    /**
+     * Read the stream contents.
+     *
+     * Over certain sizes PDO will return file handles.
+     * For backwards compatibility and consistency we smooth over that difference here.
+     *
+     * @return string
+     */
+    protected function _getContent($content)
+    {
+        if (is_resource($content)) {
+            return stream_get_contents($content);
+        }
+        return $content;
+    }
 }

tests/Fixture/PanelsFixture.php

@@ -33,7 +33,7 @@ class PanelsFixture extends TestFixture
         'title' => ['type' => 'string'],
         'element' => ['type' => 'string'],
         'summary' => ['type' => 'string'],
-        'content' => ['type' => 'text'],
+        'content' => ['type' => 'binary'],
         '_constraints' => [
             'primary' => ['type' => 'primary', 'columns' => ['id']],
             'unique_panel' => ['type' => 'unique', 'columns' => ['request_id', 'panel']],