add Hash#except to core_ext so we don't rely on activesupport being p…

…resent

lib/i18n/backend/base.rb

@@ -1,6 +1,7 @@
 # encoding: utf-8
 
 require 'yaml'
+require 'i18n/core_ext/hash/except'
 
 module I18n
   module Backend

lib/i18n/core_ext/hash/except.rb

@@ -0,0 +1,8 @@
+# from facets (http://facets.rubyforge.org)
+require 'i18n/core_ext/hash/slice'
+
+class Hash
+  def except(*less_keys)
+    slice(*keys - less_keys)
+  end
+end unless Hash.method_defined?(:except)

lib/i18n/core_ext/hash/slice.rb

@@ -0,0 +1,8 @@
+# from facets (http://facets.rubyforge.org)
+class Hash
+  def slice(*keep_keys)
+    h = {}
+    keep_keys.each { |key| h[key] = fetch(key) }
+    h
+  end
+end unless Hash.new.respond_to?(:slice)