Honor settings in recipes

If the user has specified options in with_chef_local_server or other setting as symbols then honor those. Fixes #163
I'm concerned that this will overwrite the symbol value with the string value, which is the opposite behavior of cheffish 0.7.x:  https://github.com/opscode/cheffish/blob/v0.7.1/lib/cheffish/recipe_dsl.rb#L71

In my example I was passing `:cookbook_path` in and a `"cookbook_path"` was getting set automatically.