Add basic trigger plugin scaffold

lib/vagrant/plugin/v2.rb

@@ -19,6 +19,7 @@ module Vagrant
       autoload :Push, "vagrant/plugin/v2/push"
       autoload :Provisioner, "vagrant/plugin/v2/provisioner"
       autoload :SyncedFolder, "vagrant/plugin/v2/synced_folder"
+      autoload :Trigger, "vagrant/plugin/v2/trigger"
     end
   end
 end

lib/vagrant/plugin/v2/trigger.rb

@@ -0,0 +1,23 @@
+require 'log4r'
+
+module Vagrant
+  module Plugin
+    module V2
+      # This is the base class for a trigger for the V2 API. A provisioner
+      # is primarily responsible for installing software on a Vagrant guest.
+      class Trigger
+        attr_reader :config
+
+        # Trigger
+        #
+        # @param [Object] env Vagrant environment
+        # @param [Object] config Trigger configuration
+        def initialize(env, config)
+          @env = env
+          @config  = config
+          @logger = Log4r::Logger.new("vagrant::trigger::#{self.class.to_s.downcase}")
+        end
+      end
+    end
+  end
+end