add "enabled" flag to the module

[christopherriley]

WHAT

add enabled flag to the module

[aknysh]

thanks @christopherriley

Looks good, but please rebuild README by executing these commands:

make init
make readme/deps
make readme

It will add the new variables and outputs to README.md automatically.

In general, any changes to README should be made in README.yaml (not in this case), and after that executing the commands above will rebuild README.yaml into README.md and add all new variables and outputs to README.md

Also, since resource "aws_cloudtrail" "default" has count, it's already a list (not a single resource).
We use splat+join pattern everywhere to access resources with counts (otherwise TF could throw errors in some cases).

In outputs.tf, please update all outputs to use splat+ join:

For example,

output "cloudtrail_id" {
  value       = "${join("", aws_cloudtrail.default.*.id)}"
  description = "The name of the trail"
}

thanks

[aknysh]

thanks @christopherriley