#13 Can't parse files if offline

[wren argetlahm]

With the current setup users can't run paperboy on
local feeds with external DTDs-- libxml can't resolve
the DTD reference without a network connection and so
the program dies.

We should find a way to disable this behaviour. Ideally
we will detect a network connection and if missing not
resolve them (but still resolve if we do have a
connection).

If we get that to work we might could print a warning
and prompt for whether to just use the local file if
url is provided but there's no network connection.

[wren ng thornton]

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Seems to have resolved itself insofar as paperboy exiting abnormally. We
may still want to try to prevent all the I/O error messages from libxml2