Switch to using the dep tool and update all the dependencies

vendor/github.com/aws/aws-sdk-go/service/simpledb/customizations.go

@@ -0,0 +1,11 @@
+package simpledb
+
+import "github.com/aws/aws-sdk-go/aws/client"
+
+func init() {
+	initClient = func(c *client.Client) {
+		// SimpleDB uses custom error unmarshaling logic
+		c.Handlers.UnmarshalError.Clear()
+		c.Handlers.UnmarshalError.PushBack(unmarshalError)
+	}
+}