add http:// to img_url value, otherwise things break
add http:// to img_url value, otherwise things break

kimmobrunfeldt/open-ocr,maiduchuy/open-ocrworker,tleyden/open-ocr,puffygeek/open-ocr,maiduchuy/open-ocr,kimmobrunfeldt/open-ocr,puffygeek/open-ocr,tleyden/open-ocr,maiduchuy/open-ocr