Fixed pose ROI y axis shift so the legs are not cropped

[pavloshargan]

Thanks for the code; it really came in handy!

Just a little bugfix for the full pose:

Now this:

Becomes this:

[zebular13]

Thanks for this! I have been trying to figure out the pose bug for the past week.

I made a script to check the models' accuracy here:
https://github.com/zebular13/Blaze_Accuracy_Checker

For the v10 landmarks full model, I seem to get best results with these values:
"dscale": 2.5,
"dy": 0.,

However, the accuracy is still not as good as I would like. I'm curious how it performs on your test image with those values.