Simple module to install Perl libraries via cpanm.

cpanm is a popular alternative to the CPAN client for installing Perl
libraries.  Unfortunately it can't uninstall already installed module, so it
can't handle states.
Add the `mirror` option and verify if a package is already installed.

By default, the cpanm client will use a default mirror to download
libraries, but it's possible for the end user to pass a different URL.

Since ansible favorite idempotence when possible, we verify if the
module is already installed before running the cpanm client.

Another minor additional change, the `notest` option is now a boolean.
Alias name to pkg.
Merge branch 'module-cpanm' of git://github.com/franckcuny/ansible into franckcuny-module-cpanm
Update cpanm module to newer module patterns