Minor additions to Jobs API and DeltaFetch

Added eggs/bundle.zip part and a couple of lines in "Addons" and "API".
i think this change is confusing, as eggs are mainly for uploading dependencies, not downloading them. The fact that they can be downloaded (through bundle.zip) is more accidental than an intended functionality and the changes to this wording doesn't suggest so.

I think we omit this change altogether.