Added a basic benchmark script.

v2
--

    -- fixed arguments --
    Iterations:   10000
    Elapsed Time: 0.073423862457275

    -- variable arguments --
    Iterations:   10000
    Elapsed Time: 0.084336996078491

    -- reference parameter --
    Iterations:   10000
    Elapsed Time: 0.041561841964722

v3
--

    -- fixed arguments --
    Iterations:   10000
    Elapsed Time: 0.026527881622314

    -- variable arguments --
    Iterations:   10000
    Elapsed Time: 0.080181121826172

    -- reference parameter --
    Iterations:   10000
    Elapsed Time: 0.044135808944702