collisions with openCv blobs

It would be great to have an example that showed how to have **ofxBox2d** interact with **ofxOpenCv**. Most of the examples that are out there are old and no longer work. 
I tried my hand at it, and put it here:
[https://github.com/david-sullivan/box2dCamera](https://github.com/david-sullivan/box2dCamera)

Maybe not the best code, but it works (for the most part).

thanks for the addon!