Add an implementation in Crystal

[zhangkaizhao]

This is a result in my Arch Linux x86_64 for a small dataset:

$ ../swapview/run_benchmark Crystal Go Go_3rd Python Python2 Rust <benchmark.toml 
Running Crystal...Ok(BenchmarkResult { topavg: 165806667, avg: 170036143, min: 163329268, max: 182448074, mdev: 5205681, count: 20 })
Running Go...Ok(BenchmarkResult { topavg: 199023682, avg: 208528696, min: 177594405, max: 229517343, mdev: 12087341, count: 20 })
Running Go_3rd...Ok(BenchmarkResult { topavg: 91463349, avg: 93995290, min: 88332118, max: 99816685, mdev: 3122527, count: 20 })
Running Python...Ok(BenchmarkResult { topavg: 189661013, avg: 192611708, min: 184566094, max: 200845073, mdev: 3974274, count: 20 })
Running Python2...Ok(BenchmarkResult { topavg: 282163355, avg: 286277760, min: 278530204, max: 308868004, mdev: 6509942, count: 20 })
Running Rust...Ok(BenchmarkResult { topavg: 66761983, avg: 70252466, min: 65288837, max: 76324756, mdev: 3693138, count: 20 })
                    Rust: top:   66.76, min:   65.29, avg:   70.25, max:   76.32, mdev:    3.69, cnt:  20
                  Go_3rd: top:   91.46, min:   88.33, avg:   94.00, max:   99.82, mdev:    3.12, cnt:  20
                 Crystal: top:  165.81, min:  163.33, avg:  170.04, max:  182.45, mdev:    5.21, cnt:  20
                  Python: top:  189.66, min:  184.57, avg:  192.61, max:  200.85, mdev:    3.97, cnt:  20
                      Go: top:  199.02, min:  177.59, avg:  208.53, max:  229.52, mdev:   12.09, cnt:  20
                 Python2: top:  282.16, min:  278.53, avg:  286.28, max:  308.87, mdev:    6.51, cnt:  20

with rustc 1.35.0, go 1.12.6, Python 3.7.3, Python 2.7.16 and Crystal 0.29.0.

[lilydjwg]

Thanks. It didn't run faster than Python2 in my case though.

[zhangkaizhao]

A little surprised. 😅