Add the ability to ignore retained packets when subscribed.

[njh]

Looks like a good addition, thanks.

But I wonder if the parameter should be a hash of options? So that when reading the code, it is clear what the get('topic/name', true) means?

Something like this?

get('topic/name', :omit_retained => false)

[jasiek]

That makes sense. I reckon Ruby 2's keyword params would be even nicer, but that's a separate PR.

[njh]

Note that I am currently attempting to support old versions of ruby in this gem.

Having worked in an environment that uses RHEL/CentOS, it can be very helpful if it works with old versions of ruby.

[jasiek]

Fair enough.

[jasiek]

Updated.

[njh]

Thanks!