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The environment variable name used to be AWS_DEFAULT_PROFILE but the
CLI documentation now only mentions AWS_PROFILE.

https://docs.aws.amazon.com/cli/latest/userguide/cli-environment.html

It seems like the CLI was the only tool using AWS_DEFAULT_PROFILE, and
all the AWS SDKs used AWS_PROFILE, so they standardized on it.

https://onetechnical.wordpress.com/2016/10/07/the-curious-case-of-aws_default_profile/

Note: still left AWS_DEFAULT_PROFILE on the method to set the profile to
maintain backwards compatibility.

Close #7354

Create stack's plugin README.md

The problem that can occur is ocassionally mvnw will not be executable. This can happen if mvnw is included from an archetype, as unix permissions aren't preserved within the jar they're stored in. Only using mvnw if it exists AND is executable

Add README.md to Symfony2 plugin

Bug introduced in cea941ce

* nanoc: update command aliases

- remove deprecated commands
- update `create-site`
- add `prune`

* nanoc: update README

* nanoc: update autompletion

- update commands
- add flag options to subcommands