Addon changes in fork

[dimitre]

First of all : thank you for the great addon.
I've made a fork with some changes, basically I've set up NMSBoxes to remove duplicates (Yolo only for now)
and added a simplified Object constructor accepting ofRectangle as a parameter

Object::Object(int _class_id, string _name, float _p, ofRectangle rect)

I'll be changing more things in this fork, if you find something useful I can make a PR.
Cheers