OC 1.4 came out a few days back, and I'm afraid there were a couple of changes to the API. From a quick look at LP's code, I think the only required change is to adjust for the move of the Arguments, Callback and Context interfaces from the li.cil.oc.api.network to the li.cil.oc.api.machine package.

If needed, a full list of changes can be found on the OC wiki.