fix examples and kinesis cli to use the new Auth interface

Author: wchan2

examples/example.go

@@ -46,8 +46,8 @@ func main() {
 
 	streamName := "test"
 	// set env variables AWS_ACCESS_KEY and AWS_SECRET_KEY AWS_REGION_NAME
-	auth := kinesis.NewAuth()
-	ksis := kinesis.New(&auth, kinesis.Region{})
+	auth := kinesis.NewAuthFromEnv()
+	ksis := kinesis.New(auth, kinesis.Region{})
 
 	err := ksis.CreateStream(streamName, 2)
 	if err != nil {

kinesis-cli/kinesis-cli.go

@@ -238,8 +238,8 @@ func bigIntFromStr(s string, base int) *big.Int {
 
 func newClient() kinesis.KinesisClient {
 	// NOTE: kinesis.client.go sets auth from env when empty.
-	auth := kinesis.NewAuth()
-	return kinesis.New(&auth, kinesis.Region{})
+	auth := kinesis.NewAuthFromEnv()
+	return kinesis.New(auth, kinesis.Region{})
 }
 
 func askForShardStartHash(streamName, shardId string) string {