Help needed: vendor files for Prometheus support

These are the vendor files needed for Prometheus support.
I have not been able to figure out how to do this properly with gopkg.

vendor/github.com/prometheus/procfs/proc_limits_test.go

@@ -0,0 +1,31 @@
+package procfs
+
+import "testing"
+
+func TestNewLimits(t *testing.T) {
+	p, err := FS("fixtures").NewProc(26231)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	l, err := p.NewLimits()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	for _, test := range []struct {
+		name string
+		want int64
+		have int64
+	}{
+		{name: "cpu time", want: -1, have: l.CPUTime},
+		{name: "open files", want: 2048, have: l.OpenFiles},
+		{name: "msgqueue size", want: 819200, have: l.MsqqueueSize},
+		{name: "nice priority", want: 0, have: l.NicePriority},
+		{name: "address space", want: 8589934592, have: l.AddressSpace},
+	} {
+		if test.want != test.have {
+			t.Errorf("want %s %d, have %d", test.name, test.want, test.have)
+		}
+	}
+}