Add Perl tutorial files.
Add cpan install note to perl README.
Add guide for ubuntu install of perl prereqs.
Improve perl tutorial files.

Fixed a few spelling errors. Removed unnecessary timeout argument from
some connections. Removed on_return callback from send.pl. Modified
rpc_client to allow parameter passing. Added autoflush, $|++, to allow
for automated testing.
Merge pull request #13 from Lanzaa/master

Add tutorial files for perl.
Thanks to Lanzaa.
Add perl to tests
Message always publish to localhost. Reuse base 'channel' method to publish and subscribe on one instance (via change connection host to not localhost).
Merge pull request #14 from pavel-drobushevich/patch-1

Message always publish to localhost. Reuse base 'channel' method to publ...
Take new directory listing format into account
Handle closed connection to RabbitMQ for Node.js task worker.