changed it to execute recipes on all instances in a layer

The stack looks like this:
![screen shot 2014-09-11 at 11 01 57 am](https://cloud.githubusercontent.com/assets/2453875/4237208/05d9a21e-39cd-11e4-9bc3-21623ac00f6f.png)


First command: `bundle exec bin/opsicle execute-recipes staging -r sportngin-platform::list-attributes -l main-utility` 
Second command: `bundle exec bin/opsicle execute-recipes staging -r sportngin-platform::list-attributes -l main-utility,rails-puma-app`

deployments looks like:

![screen shot 2014-09-11 at 11 01 42 am](https://cloud.githubusercontent.com/assets/2453875/4237238/3af68a8e-39cd-11e4-9800-291f01bb4ec2.png)

As you can see the first command ran on only 1 instance (the main utility layer), the second command ran on 3 instances (main-utility + rails-app)