Add an option to disable wget completely

[m13253]

Motivation

I would like to request for an option to disable wget completely. I want to deploy Kippo on my production server, that is, any possible manner to make a network request should be rejected.

Expected response:

When the user tries to download something, he will get:

Resolving <domain> (<domain>)... failed: Name or service not known.
wget: unable to resolve host address ‘<domain>’

Or if an IP address (IPv4 / IPv6) is provided:

Connecting to xxx.xxx.xxx.xxx:80... failed: Network is unreachable.

127.0.0.0/8 subnet and ::1 should behave a little differently:

Connecting to 127.0.0.1:80... failed: Connection refused.

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Maybe I will implement myself and submit a PR weeks later. But I decide to ask for comments in advance. I would appreciate it if anyone can offer me some help.