feat: add Gopkg manifests, move fixtures to testdata, add vendor dependencies

vendor/github.com/tj/go-debug/example/multiple.go

@@ -0,0 +1,25 @@
+package main
+
+import . "github.com/visionmedia/go-debug"
+import "time"
+
+var a = Debug("multiple:a")
+var b = Debug("multiple:b")
+var c = Debug("multiple:c")
+
+func work(debug DebugFunction, delay time.Duration) {
+	for {
+		debug("doing stuff")
+		time.Sleep(delay)
+	}
+}
+
+func main() {
+	q := make(chan bool)
+
+	go work(a, 1000*time.Millisecond)
+	go work(b, 250*time.Millisecond)
+	go work(c, 100*time.Millisecond)
+
+	<-q
+}