Merge pull request #51 from brianfoshee/update-go-version

Add Go 1.6 test target as well as most recent 1.5 release

.travis.yml

@@ -1,6 +1,7 @@
 language: go
 go:
-- 1.5.1
+  - 1.5.3
+  - 1.6
 before_install:
 - sudo mkdir --mode 0777 -p /var/ftp/incoming
 - sudo apt-get update -qq