* prevent negative coordinates for textlines in marginals
* prevent negative coordinates for textlines in marginals
* fix a bug in the contour logic, #8
* fix a bug in the contour logic, #8
* the binarization model is added into the models and now binarization of input can be done at the first stage of eynollah's pipline. This option can be turned on by -ib (-input_binary) argument. This is suggested for very dark or bright documents