capistrano/capistrano — pull request #958 by juanibiapina (2014-03-06 18:22:10+00:00)
Title: Add keys method to return all set configuration keys.

As discussed here: #957

This exposes all currently set configuration keys to a task that can print all of them, for instance:

``` ruby
task show_config do
run_locally do
env.keys.sort.each do |key|
info "#{key} = #{fetch key}"
end
end
end
```