Don't use signal.Stop for Go less than 1.1.

signal_stop_1.0.go

@@ -0,0 +1,12 @@
+// +build !go1.1
+
+package goworker
+
+import (
+	"os"
+)
+
+// Stops signals channel. This does not exist in
+// Go less than 1.1.
+func signalStop(c chan<- os.Signal) {
+}

signal_stop_1.1.go

@@ -0,0 +1,14 @@
+// +build go1.1
+
+package goworker
+
+import (
+	"os"
+	"os/signal"
+)
+
+// Stops signals channel. This function exists
+// in Go greater or equal to 1.1.
+func signalStop(c chan<- os.Signal) {
+	signal.Stop(c)
+}

signals.go

@@ -52,7 +52,7 @@ func signals() <-chan bool {
 		defer close(signals)
 
 		signal.Notify(signals, syscall.SIGQUIT, syscall.SIGTERM, os.Interrupt)
-		defer signal.Stop(signals)
+		defer signalStop(signals)
 
 		<-signals
 		quit <- true