Add note about image name to aws-import.

Author: nikhilm

docs/aws.md

@@ -229,8 +229,6 @@ nodejs -handler sns.handler sns.js
 This will create a local docker image. The `publish-function` command will
 upload this to Docker Hub and register it with IronWorker.
 
-FIXME(nikhil): AWS credentials bit.
-
 To be able to use the AWS SDK, you'll also need to set two environment
 variables. The values must be your AWS credentials.
 

docs/import.md

@@ -29,6 +29,11 @@ ironcli lambda aws-import my-function
 will import the function code to a directory called `./my-function`. It will
 then create a docker image called `my-function`.
 
+Using Lambda with Docker Hub and Iron Worker requires that the Docker image be
+named `<Docker Hub username>/<image name>`. This is used to uniquely identify
+images on Docker Hub. Please use the `-image <Docker Hub username>/<image
+name>` flag  to `aws-import` to create a correctly named image.
+
 If you only want to download the code, pass the `-download-only` flag. The
 `-region` and `-profile` flags are available similar to the `aws` tool to help
 you tweak the settings on a command level. If you want to call the docker image