Revert "Rails: Added support for Figaro application configuration"

This reverts commit b85345163b0eeacb16fd4b04a18ca36e21ff476b.
Merge branch 'master' into config

* master:
  Revert "Rails: Added support for Figaro application configuration"

Conflicts:
	README.md
	cookbooks/rails/recipes/default.rb
	examples/deploy-multi-stage.rb
	examples/deploy.rb
	nodes/sample_host.json