Add curl extension config, uses cli-server to test

Author: dshafik

Diff for: travis/ext/curl/setup.sh

@@ -0,0 +1,5 @@
+#!/bin/bash
+export PHP_CURL_HTTP_REMOTE_SERVER="http://localhost"
+cd ./ext/curl/tests/responder
+sudo php -S localhost:80 &
+cd -