Add support for named profiles in credentials file
Add support for named profiles in credentials file

This change adds the option to use a `~/.aws/config` formatted file. See: https://docs.aws.amazon.com/cli/latest/userguide/cli-multiple-profiles.html
DualSpark/rusoto,rusoto/rusoto,rusoto/rusoto,mattico/rusoto,rusoto/rusoto,DualSpark/rust-aws,DualSpark/rust-aws,mattico/rusoto,SecurityInsanity/rusoto,mattico/rusoto,SecurityInsanity/rusoto,DualSpark/rusoto,DualSpark/rusoto,DualSpark/rust-aws