Initial OpenCv formula based off of @pizthewiz gist - addresses #3039

don't merge yet. 
still to do. 

- [ ] find a better way to keep _buildroot folder clean ( right now lipo will suck up any lib in _buildroot/lib/)

ping @pizthewiz 

- changes removed OpenCL as it was causing errors 
- removed some other libs not needed ( CUDA etc ) 
- lipo for loop wasn't working - fixed. 
- error suppression for lipo incase lib is already FAT 
- libtool into a single opencv.a