OpenCV-3.1 bindings in the making

[basvandijk]

I would like to propose adding a reference to our OpenCV-3.1 binding to the Computer Vision section. The library is not complete nor released to hackage yet. However it's already very usable and used in production. See:

https://github.com/LumiGuide/haskell-opencv

[Gabriella439]

I did an initial pass over the Computer Vision section to add information on LumiGuide and haskell-opencv here:

7646bb5

Feel free to submit a pull request if you would like to make any other changes or advertise LumiGuide more! :)