convert environment hash keys to strings

by converting the hash keys to strings, we can use symbols in our
environment blocks:

    environment {FOO: 'bar', SHELL: 'zsh'}

1 files changed, 5 insertions, 1 deletions

diff --git a/lib/mixlib/shellout.rb b/lib/mixlib/shellout.rb
index c77fdcf..6f8730f 100644
--- a/lib/mixlib/shellout.rb
+++ b/lib/mixlib/shellout.rb
@@ -332,7 +332,11 @@ module Mixlib
         when 'log_tag'
           self.log_tag = setting
         when 'environment', 'env'
-          self.environment = setting || {}
+          if setting
+            self.environment = Hash[setting.map{|(k,v)| [k.to_s,v]}]
+          else
+            self.environment = {}
+          end
         when 'login'
           self.login = setting
         else