Make travis check format, and test it..

.travis.yml

@@ -8,6 +8,7 @@ install:
     - go get -v .
     - go get -v github.com/golang/lint/golint
 script:
+    - diff <(gofmt -d .) <("")
     - go vet -x ./...
     - golint -set_exit_status ./...
     - go test -v -race ./...

examples/airhorn/main.go

@@ -1,7 +1,7 @@
 package main
 
 import (
-	"encoding/binary"
+"encoding/binary"
 	"flag"
 	"fmt"
 	"io"