Log Message:
Update to 0.18

Changelog:
0.18
	- change threshold for combining headers and body from 1024 bytes to 8192

0.17_01
	- reduce rt_sig* syscalls (kazeburo)

0.16
	- Set REMOTE_PORT environment variable (kazeburo)

0.15
	- unbundle Plack::Standalone::Server::Prefork::Server::Starter (see `perldoc \ 
Starlet` to find out how to boot Starlet using Server::Starter)