JSON output: please add right encoding

[gubi]

I encountered a problem with the json output: accented vowels and apostrophes were parsed as "\u00e0" or "\u2019".
I solved simply by adding the native php json_encode() suffix JSON_FORCE_OBJECT|JSON_UNESCAPED_UNICODE in

php-rest-service/RestService/Client.php

Line 251 in 3263cd2

if (!is_string($json)) $json = json_encode($json);

like this:

if (!is_string($json)) $json = json_encode($json, JSON_FORCE_OBJECT|JSON_UNESCAPED_UNICODE);

Please integrate it in your code ;)

[marcj]

Please provide a pull-request, so I can merge.