Allow .env changes without redeploy

Currently since the .env template resource lives in the deploy resource
you need to redeploy in order to change any of the .env values. This
moves the .env template resource outside of the deploy resource and
haves it notify the unicorn and sidekiq resource if any values change.
Merge pull request #300 from opscode/env_changes_without_deploy

Allow .env changes without redeploy