Update 0.18 to 0.24
0.24
- worker processes always receive different sequence of values when
  calling "rand()"
0.23
- serialize calls to select -> accept when listening to multiple ports
0.22
- listen to multiple ports passed from Server::Starter (ttakezawa)
0.21
- support listening to unix socket (passed by Server::Starter) (kazeburo)
0.20
- support HTTP/1.1 (kazeburo)
0.19
- update the dependencies now that Plack no more depends on LWP
          (miyagawa; https://github.com/plack/Plack/pull/408)
- add support for psgix.harakiri (audreyt)

(mef)