add disable_count_reqs_per_child option
use Plack::Runner in t/disable_count_reqs_per_child.t
if passed --max-reqs-per-child=0, child process is not existed by number of requests
rename test
oops
fix t/max_reqs_per_child_0.t
Merge pull request #2 from soh335/feature/disable_count_reqs_per_child

add disable_count_reqs_per_child option