BUG: Try fixing #70 CL_OUT_OF_RESOURCES exception

[squll1peter]

In this PR, I tried to resolved issue #70 by adding GPUImage counterpart of template rebind and adding recursive grafting in OpenCL Pyramids. Besides, an memory allocation limit is added to GPURecursiveGaussianImageFilter to reduce unnecessary large amount of GPU global memory allocation in the kernel.
Detailed discussion is in #70.

[mstaring]

@dpshamonin Would you have time to take a look at this PR?

[mstaring]

@N-Dekker would you be able to add your suggestions to this PR?

[N-Dekker]

@ntatsisk I guess we may close this pull request now, as it is entirely superseded by your #734, right?

[ntatsisk]

that's right, @N-Dekker!