Add comparison to benchmarks
Add comparison to benchmarks

This sorts the runs in order of speed and shows the relative speed difference:

```
Comparison:
           addition2: 24011974.8 i/s
           addition3: 23958619.8 i/s - 1.00x slower
addition-test-long-label:  5014756.0 i/s - 4.79x slower
            addition:  4955278.9 i/s - 4.85x slower
```

JuanitoFatas/slim,slim-template/slim,ericboehs/slim,slim-template/slim,raxoft/slim,raxoft/slim,ericboehs/slim,JuanitoFatas/slim,slim-template/slim