Document all AWS env vars
ignore backfill/ folder
Link to vagrant-aws plugin
Add detailed "run" instructions
Document usage of standard AWS env var names
Revert "ignore backfill/ folder"

This reverts commit 7cf9233a5f86f07deb3cc9b974c2c5183ab3db85.
Document Kibana Url
Be explicitly about where you are importing logs from
Merge pull request #30 from cityindex/aws-documentation-clarrifications

AWS documentation clarifications