CUDA installation for a specific version

[gridhead]

There are certain situations where people using Tensorflow and other such libraries require a specific version of CUDA. Albeit the installer provides the most recent one, CUDA installation of multiple versions can coexist (with minor replacements with the dependencies used by either) so the users should be given a choice to do that.

[onuralpszr]

@t0xic0der assign to me

Initial PR started : #126