Add a -I option to load modules from lib or elsewhere

[book]

While looking at a module under lib/Some/Module.pm, I was expecting the following to just DWIM:

isa-splain -Ilib Some::Module

but instead I got:

Unexpected argument -Ilib E<App::Isa::Splain#3>

[kentfredric]

Indeed, I have intended on this myself.

Though as a temporary work-around perl -Ilib -S isa-splain Some::Module should work