obfs4proxy should use "golang.org/x/net/proxy"
I should have changed this when I dealt with the "go.crypto" repository move, but I didn't.
It's a simple change of import paths in 3 files, but this breaks packaging and the TBB nightly builds if I commit it, so I'm opening a ticket to ensure that the right things happen in all the relevant places.
This isn't particularly high priority since the old code still works, but switching to this, and having Tor Browser pull it in will let me kill off the go.net tarball that's used as part of the 4.5a build.
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