Add openpose model into the repo

Author: dmitrygolovkin

caffe_models/openpose/pose/caffe_model/README.md

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+# Model Description
+* **Model Repo:** https://github.com/CMU-Perceptual-Computing-Lab/openpose
+* Prototxt and caffemodel
+  + **pose_deploy_linevec.prototxt**: Small edits in dims of https://github.com/CMU-Perceptual-Computing-Lab/openpose/blob/master/models/pose/coco/pose_deploy_linevec.prototxt
+  + **pose_deploy_linevec.caffemodel**: random generated weights
+  + **pose_iter_440000.caffemodel**: weights file sent by M.Tomono, maybe download by this script https://github.com/CMU-Perceptual-Computing-Lab/openpose/blob/master/models/getModels.sh
+

caffe_models/openpose/pose/caffe_model/pose_deploy_linevec.caffemodel

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+version https://git-lfs.github.com/spec/v1
+oid sha256:a928f3bcd5041b770827f0ac1d3166853af9a05661791a33b828f7c0c3686f42
+size 209267902