[#78] Use verbose resource name for `mount` in recipes/data

Fixes <http://acrmp.github.com/foodcritic/#FC022>
[#78] Remove unneccessary interpolation in elasticsearch-env.sh.erb template

Fixes <http://acrmp.github.com/foodcritic/#FC002>
[#78] Prefer `not_if` instead of Ruby `unless` condition in recipes/proxy

Fixes <http://acrmp.github.com/foodcritic/#FC023>

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Note by @karmi: This Foodcritic rule is actually quite dubious, as stated on the site.
                But for the sake of static code analysis gods, why not.
Use `Chef::Log.debug` instead of `STDOUT.print` in recipes/proxy