cv::Mat to CDenseFeature conversion Factory and vice versa.

I have made a factory which directly converts any cvMat object into any(required) type of CDenseFeatures. 
and  CDenseFeature<float64_t> into the required type of cvMat (any)
Hey @pickle27 , I think this test covers all possible conversions.  What's left. We have covered all the 64 conversions that are possible here.