Implemented a test for runG which test against the stencil
implementation in accelerate. Could also test against the already
implemented Ypnos version too.
Added some basic benchmarking support.
TODO:
* The file: Benchmark.hs needs to be made a binary in the cabal file.
* We should be testing against a stock Ypnos implementation rather than
  Accelerate.
* Need to try running it on Bactra.