99designs/vacuumetrix — pull request #18 by sabyasachi (2014-06-06 09:20:06+00:00)
Title: Add support for - AWS IAM roles for instances

For obvious reasons using IAM role is better than hardcoding aws keys in your code.
More: http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/iam-roles-for-amazon-ec2.html