Fix Travis to properly fail the build on go fmt and go vet.

When running go fmt/vet, they do not exit non-zero if they detect any issues,
they only print out information. This wraps go fmt/vet in a script that
captures the output to a temp file and checks if anything was written to it.
If any was, it prints it out then exits 1.

.travis.yml

@@ -13,8 +13,8 @@ install:
 - go get github.com/mattn/goveralls
 script:
 - go build
-- go fmt ./...
-- go vet ./...
+- ./travis/gofmt.sh
+- ./travis/govet.sh
 - go test -i -race ./...
 - go test -v -race ./...
 - ./travis/coveralls-script.sh

travis/gofmt.sh

@@ -0,0 +1,13 @@
+#!/bin/sh
+
+# run go fmt and exit non-zero if it detected anything
+T=$(mktemp -t gofmt.XXXXX)
+go fmt ./... > $T
+if egrep -q '.*' "$T" ; then
+	echo "go fmt failed on the following files:"
+	cat "$T"
+	rm $T
+	exit 1
+fi
+rm $T
+exit 0

travis/govet.sh

@@ -0,0 +1,13 @@
+#!/bin/sh
+
+# run go vet and exit non-zero if it detected anything
+T=$(mktemp -t govet.XXXXX)
+go vet ./... > $T
+if egrep -q '.*' "$T" ; then
+	echo "go vet failed on the following files:"
+	cat "$T"
+	rm $T
+	exit 1
+fi
+rm $T
+exit 0