Multicore parser.ParseAddress()

[mzimmerman]

parser.ParseAddress() is not multicore. I'm trying to parse a large dataset and this is severely hurting my performance.

[mzimmerman]

After more reading, I found that the underlying libpostal isn't multi, so I wrote this hack: https://github.com/mzimmerman/gopostalmulti which essentially forks out. This is probably not a great solution but it's certainly helped my throughput!