Tor 0.0.7.1 is out; servers need to upgrade

[Roger Dingledine]

Thanks to Ben and weasel, we've (I hope) tracked down the bug that
crashed all the exit nodes yesterday.

tarball:   http://freehaven.net/tor/dist/tor-0.0.7.1.tar.gz
signature: http://freehaven.net/tor/dist/tor-0.0.7.1.tar.gz.asc

Only servers need to upgrade; clients should be fine with 0.0.7.

Improvements since 0.0.7:
  - When an address resolves to 0.0.0.0, treat it as a failed resolve,
    since internally we use 0.0.0.0 to signify "not yet resolved".