Specifically disable web access

[sharky93]

We cannot allow the container to have access to the web. It might come in handy if the user wants to process code on any random image from the internet, but this also sets up the stage for arbitrary communication.

[stefanv]

Note that this type of thing should be configurable.

[sharky93]

Sure

[sharky93]

Fixed by d4b20c3

For configurability, refer to - #4