A hacked up drawContour function.

This function is a great example of how some rearchitecturing is needed.
We lose functionallity at the C wrapper by hiding the origin.
We lose functionallity at the high level haskell function by hiding the
line type and thickenss.

In the future hopefully someone will make a CV/Bindings/* that is more
complete.  Then, we can add non-Ptr types and fully functional haskell
operations based on these primitives.
Add capabilities to get/draw contours.