Use go tip for now

.travis.yml

@@ -2,7 +2,7 @@ language: go
 go:
 - 1.2
 - 1.3
-- 1.4
+- tip
 
 env:
 - KAFKA_INSTALL_ROOT=/home/travis/kafka KAFKA_HOSTNAME=localhost
@@ -24,3 +24,7 @@ script:
 
 notifications:
   flowdock: 15e08f7ed3a8fd2d89ddb36435301c1a
+
+matrix:
+  allow_failures:
+    go: tip