Curl on Windows

[qvrb]

In trying to get this working, i had no problem running curl on ubuntu and getting the text back from the ocr webservice. however, when i tried to run curl on windows I got an error back saying unable to unmarshal json, after a fair amount of time (not being familiar with docker compose), i got into the log (docker-compose logs) and worked out it's something to do with illegal characters - this is kinda mentioned in issue 49, but the answer isn't so the curl command for windows should be

curl -X POST -H "Content-Type: application/json" -d "{\"img_url\":\"http://bit.ly/ocrimage\",\"engine\":\"tesseract\"}" http://MY-HOST-IP-ADDRESS:9292/ocr