Unit Testing

[cdeterman]

As things currently stand, I don't have personal access to an NVIDIA GPU. As such, I can currently only test the OpenMP backend of this package. Likewise, I am therefore unable to test gpuRcublas either. I can write the tests but I currently will need volunteers who are willing to install these packages and run the unit tests to confirm they are working properly until such a time that a continuous integration platform provides access to an NVIDIA GPU.