Tried to export OCL module into python

Hello!

This is a minimal effort 'ocl' module exposure into python.
It adds ocl_oclMat object which reperesents gpu array.
'Cuda' module may be exposed in a similar way, but it takes too much time to build it so is tried the 'ocl' as a proof-of-concept.

It would be desirable to achieve interoperability with PyOpenCL/PyCuda some way.

Not sure if it should be merged as is, but to start a discussion.