hops-webpack always builds a node version if in non-static mode

[KnisterPeter]

This is my intent (choose one)

• I want to report a bug
• I want to request a feature or change
• I want to provide or change a feature

The problem

If I never need a node build of my hops app, then I'm still needing the time and cpu to build the node version.

Proposed solution

I would like to add a cli flag (e.g. --node or --server) with a default to true to maintain current compatibiliy and the option to set it to false (e.g. --node=false or --no-node) to skip the node build at all.