Remove host argument:

Currently the idea is to later implement a -h (or -t) option to the
command, and/or a `target' recipe keyword. Another option might be to
use the target/host key when the key/value registry will be implemented
and made available to the recipe and task DSLs.

features/steps/recipe_steps.rb

@@ -3,5 +3,5 @@ Given(/^a recipe with:$/) do |recipe_body|
 end
 
 When(/^I execute the recipe$/) do
-  run_simple('producer localhost recipe.rb', false)
+  run_simple('producer recipe.rb', false)
 end