Feature Request: easy way to disable file renaming

[dominic-p]

First off, thanks for the great plugin. I really love working with it.

One minor issue for me is that I don't want asset files renamed. In order to accomplish that I'm currently defining the following template function:

meta => meta.name + '.' + meta.ext + meta.query

This works, but, in my opinion, it would be a lot cleaner and more future proof to have a simple switch to disable file renaming. Maybe you could just pass false to the hashFunction setting?