README.md: add notes on Vagrantfile
geobearrc.example: mark it non-executable
GeobearDnsResolver.java: round-robin balance NIO Resolver pool
log4j.properties: mute a log that performed slow
Vagrantfile: vagrant environment for Geobear testing
benchmark-geobear.bash: example how to do performance benchmark
.gitignore: ignore Vagrant and geobearrc