WsdlDownloader fix: remote includes now work correctly with relative URLs & tests added

src/BeSimple/SoapClient/Xml/RemoteFileResolver.php

@@ -0,0 +1,32 @@
+<?php
+
+namespace BeSimple\SoapClient\Xml;
+
+use Exception;
+
+class RemoteFileResolver
+{
+    public static function instantiateResolver()
+    {
+        return new self();
+    }
+
+    /**
+     * @param string $wsdlPath File URL/path
+     * @return boolean
+     */
+    public function isRemoteFile($wsdlPath)
+    {
+        $parsedUrlOrFalse = @parse_url($wsdlPath);
+        if ($parsedUrlOrFalse !== false) {
+            if (isset($parsedUrlOrFalse['scheme']) && strpos($parsedUrlOrFalse['scheme'], 'http') === 0) {
+
+                return true;
+            }
+
+            return false;
+        }
+
+        throw new Exception('Could not determine wsdlPath is remote: '.$wsdlPath);
+    }
+}