Enable explicit match on root annotation / setting

[brianehlert]

Enable a new setting to support explicit match on root.

There is an option in NGINX to allow only explicit match on root.
By default NGINX will match any path under root when root is defined.

For example: if the configured paths are '/', '/tea', and '/coffee' you will find that '/beer' will also match the '/' path because the default match is not explicit. If explicit was enabled for '/', then only artifacts at '/' would match and the path '/beer' would receive a 404.