Make orderBy parameter actually do something

[caitp]

Okay, there are problems with this, I'm not totally sure how this is going to work, but there must be a way to do this sensibly, hmm? I'll look into this in a bit, after updating the demo site to take advantage of the new functionality.

[ghost]

I don't think we need orderby. My comments have orderby button which invokes server to reload data for the new order