Support a "create" command

[jweyrich]

The create command (e.g.: static-deployer create ... ) should:

1. Create the specified bucket (always private) if it doesn't exist;
2. Create the CloudFront distribution if it doesn't exist;
   2.1. May need to support an SPA (single page application) flag;
   2.2. May need to support custom error responses for SPA - to redirect 404 to /index.html for example;
   2.3. Enable OAI to access a private S3 bucket;
3. Create or associate domain and alternate domains;
4. Create or associate SSL certificates from ACM (needs to issue them in the NV region due to AWS limitations);