Improve HTTP client to raise exceptions

app/Core/Http/InvalidStatusException.php

@@ -0,0 +1,19 @@
+<?php
+
+namespace Kanboard\Core\Http;
+
+class InvalidStatusException extends ClientException
+{
+    protected $statusCode = 0;
+
+    public function __construct($message, $statusCode)
+    {
+        parent::__construct($message);
+        $this->statusCode = $statusCode;
+    }
+
+    public function getStatusCode()
+    {
+        return $this->statusCode;
+    }
+}