Perlbrew Release 0.41

perlbrew 0.41 contain minor fixes:

Fix installation issue when the specified version is not listed in CPAN::Perl::Releases
Fix sub-shell invocation for 'switch' and 'use' command. This is particularly for csh users, but it should also work for bash users.

The sub-shell is a fallback when user does not sourcing the perlbrew bashrc in their ~/.bash_profile or ~/.zshenv. However it is advertised to avoid using sub-shell, but just include bash/zsh integration for much better experience.

Also notice that, on Mac OSX Lion, zsh sub-shell is not working at all due to the content of /etc/zshenv.