Sketch of listing stored configs.
Write configuration to S3 bucket.
Fix for undefined descriptions.
Merge branch 'master' into s3-store
sslEnabled is true by default in aws-sdk
Note require bucket config value
Merge pull request #38 from mapbox/s3-store

Use S3 as canonical store for configs
merge master into s3-template
deal with fallout from merge of #38
- readFile needs to know what region to look for the template in
- if you specify a template in another region, error tells you so
- urls for template files are correctly region-specific
- .cfnrc can contain bucketRegion if config bucket not in us-east-1