adds pstotext to Dockerfile
adds pstotext to Dockerfile

jpadilla/textract,lucadealfaro/textract,deanmalmgren/textract,scalp42/textract,Nift/textract,lucadealfaro/textract,deanmalmgren/textract,Nift/textract,jpadilla/textract,deanmalmgren/textract,lucadealfaro/textract,scalp42/textract,Nift/textract,jpadilla/textract,scalp42/textract