merkledag: LONG timeout on Get

we shouldn't use an arbitrary timeout here. since Get
doesnt take in a context yet, we give a large upper bound.
think of an http request. we want it to go on as long as
the client requests it.

merkledag.go

@@ -229,7 +229,11 @@ func (n *dagService) Get(k u.Key) (*Node, error) {
 		return nil, fmt.Errorf("dagService is nil")
 	}
 
-	ctx, _ := context.WithTimeout(context.TODO(), time.Second*5)
+	ctx, _ := context.WithTimeout(context.TODO(), time.Minute)
+	// we shouldn't use an arbitrary timeout here.
+	// since Get doesnt take in a context yet, we give a large upper bound.
+	// think of an http request. we want it to go on as long as the client requests it.
+
 	b, err := n.Blocks.GetBlock(ctx, k)
 	if err != nil {
 		return nil, err