Added an alternative way to lookup the country when geoiplookup isn't available#3

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hdrlab wants to merge 2 commits intosilverstripe-archive:masterfrom

Commits on Oct 16, 2012

Updated GeoIP so that it can (optionally) work using MaxMind geolocation databases when geoiplookup is unavailable (e.g., the server has exec() disabled for security reasons).
hdrlab
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Added IPv4 and IPv6 lookup tests.
hdrlab
committed