Updated PageRank unit tests to use the new approach for defining different test parameters.
Added a comment to the PageRank unit tests file clarifying that the tests for the hybrid incoming algorithm will fail when using float instead of double precision calculations due to differences in single precision calculations between the CPU and the GPU.
Defined the global variables in the PageRank unit test as static to reduce namespace polution
Merge pull request #12 from ahgharaibeh/refactor-unittests

Updated PageRank unit tests to use the new approach for defining the vanilla and the different configurations of hybrid implementations.