streamline code
Use Mojo::UserAgent to download cpan_package_file

Also remove dependency to LWP::Simple.
add tests!

--HG--
extra : amend_source : 47eeea83d28a0c62ecf60219a047295cf5a22549
version 0.009

--HG--
extra : amend_source : 56223734f9caa03c7a173f86a28ed6fbcc23ed6c
Added tag v0.009 for changeset 8ca2c9be4f94
forgot to add manifest