Add unity web gl benchmark

Unity WebGLBenchmark. 
- All source code was added, so the benchmark is self-contained
- Some files we too big (one in particular would not even be allowed to by hosted on Github because size > 100MB). They we compressed and README was updated so make notice that and also instructions on how to uncompress.
I think you could use if (test[0] in benchmarks) and avoid this loop, which would make this more readable. I had to read it twice before I got your intention :)