Fix benchmarks for Array#fizznuzz and Range#fizzbuzz.

Also, add GC.start to clean a little bit before running benchmarks.

Signed-off-by: Krzysztof Wilczynski <krzysztof.wilczynski@linux.com>
Correctly return Enumerator when integrating with Range class.

Signed-off-by: Krzysztof Wilczynski <krzysztof.wilczynski@linux.com>
Don't run test before benchmark.

Signed-off-by: Krzysztof Wilczynski <krzysztof.wilczynski@linux.com>
Fix. Don't use Enumerable#entries for Array.

Use Array#to_a on Array which returns self.

Signed-off-by: Krzysztof Wilczynski <krzysztof.wilczynski@linux.com>
Re-factor FizzBuzz#fizzbuzz a little.

Signed-off-by: Krzysztof Wilczynski <krzysztof.wilczynski@linux.com>
Add comment about rb_str_new2(const char *) being slow.

Signed-off-by: Krzysztof Wilczynski <krzysztof.wilczynski@linux.com>