Added missing resolveIntersections function

[samw3]

Hi!

I was just trying to build ofxCorkCsg and was getting a linker error. It looks like there is a missing wrapper function. I used computeIntersection as a template to create the missing resolveIntersections. This compiles now, but I haven't tested this function (not sure how the lib works exactly yet). So you might want to double check it.

Cheers! Sam