Mark config.enable_nfs as deprecated

CHANGELOG.md

@@ -4,6 +4,8 @@ BACKWARDS INCOMPATIBILITY:
 
   - Automatic handling of multiple machine scoped cache dirs from versions
     prior to 0.3.0 of this plugin was removed.
+  - Support for `enable_nfs` has been deprecated and will be removed on 0.7.0,
+    please use `cache.synced_folder_opts = {type: 'nfs'}` instead.
 
 ## [0.5.1](https://github.com/fgrehm/vagrant-cachier/compare/v0.5.0...v0.5.1) (Dec 20, 2013)
 

lib/vagrant-cachier/config.rb

@@ -1,7 +1,7 @@
 module VagrantPlugins
   module Cachier
     class Config < Vagrant.plugin(2, :config)
-      attr_accessor :scope, :auto_detect, :enable_nfs, :synced_folder_opts
+      attr_accessor :scope, :auto_detect, :synced_folder_opts
       attr_reader   :buckets
 
       ALLOWED_SCOPES = %w( box machine )
@@ -16,6 +16,14 @@ module VagrantPlugins
         (@buckets ||= {})[bucket] = opts
       end
 
+      def enable_nfs=(value)
+        puts "The `enable_nfs` config for vagrant-cachier has been deprecated " \
+             "and will be removed on 0.7.0, please use " \
+             "`synced_folder_opts = { type: 'nfs' }` instead."
+
+        @synced_folder_opts = { type: 'nfs' } if value
+      end
+
       def validate(machine)
         errors = _detected_errors