Added Submission::link and Comment::comment_link

[khalilfazal]

trafficstars

The method names are confusing. Why does Submission::permalink return a relative path instead of an absolute path? Why does Comment::link return the link to the submission instead of a link to the comment itself?

[khalilfazal]

So I don't think it's my fault that travis can't build. It is having trouble installing jruby.

[StephanMeijer]

Reddit calls a submission also a link. Please suffix your functions with _url instead of _link.

[StephanMeijer]

Maybe change to other link-function to url as well?

[StephanMeijer]

Thank you. I will merge it into my fork (https://github.com/StephanMeijer/redd/)