Improved code for deciding to use Parallel::Prefork
Add code for respond an error when the value of "mailer" is empty
Add description for installing from CPAN
Update AC_INIT macro(0.2.12)
Update SYSVERSION macro(0.2.12)
Haineko 0.2.12
Fix spell
Release notes for 0.2.12
Update for 0.2.12 release
Fix README.md