list_topics

To run this example:

1. Start vagrant box: vagrant up
2. Build kafka-pixy: go install ./...
3. Start kafka-pixy: ${GOPATH}/bin/kafka-pixy --kafkaPeers=192.168.100.67:9091 --zookeeperPeers=192.168.100.67:2181
4. Run it: go run examples/get_topics/main.go