converting IPv4 string to uint32 (and back again)

[Nate Finch]

http://play.golang.org/p/H1DI2Bw1OY

Michael was working on translating an ipv4 strings to uint32 (he said int,
but I hope he meant uint32).  He was hand coding it, but I figured there
was a better way using the built-in libraries.  Turns out it's not too
bad.  The code is in the link above.  I thought it was interesting, so I'm
cc'ing juju-dev.

The only thing I wasn't sure about was BigEndian vs. LittleEndian.  IMO,
0.0.0.5 -> 5 makes the most sense, so I went with BigEndian.  I suppose it
doesn't matter as long as the conversions are kept consistent in both
directions.

-Nate
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