Install zookeeper/kafka during CI runs

.travis.yml

@@ -1,4 +1,10 @@
 language: go
 go:
-  - 1.1
-  - 1.2
+- 1.1
+- 1.2
+
+before_install:
+- sudo apt-get install zookeeper 2>&1
+- wget http://apache.mirror.nexicom.net/kafka/0.8.1/kafka_2.10-0.8.1.tgz -O kafka.tgz
+- mkdir -p kafka && tar xzf kafka.tgz -C kafka --strip-components 1
+- nohup bash -c "cd kafka && bin/kafka-server-start.sh config/server.properties &"