Move freeze into system startup and rollback into After hook

This is tricky because if the box were started outside this system in
an unfrozen state, the code as written would not notice that. need to
think on that

also rollback and possibly freeze doesn't seem to be actually
working, just noticed, but suspect the bug's been there for some time.

features/step_definitions/steps.rb

@@ -1,3 +1,7 @@
+After do
+  @mybox.rollback
+end
+
 Given /^a vagrant vm (\w+) (?:is running|is up|)$/ do |box|
   @mybox=VagrantBox.new(box)
   @mybox.up

features/support/vagrantbox.rb

@@ -22,6 +22,8 @@ def up
     if @env.primary_vm.state != :running
       print "Booting #{@name} patience..."
       @env.cli("up")
+      puts "frezzing mv state..."
+      self.freeze
       puts "done"
     end
     raise "Failed to start vm #{@name} " if @env.primary_vm.state != :running

features/vagrant_boots.feature

@@ -1,15 +1,11 @@
 Feature: Booting
 
 I want to cold boot a development VM
-freeze state
-run Scenario
-revert state
-loop
-shutdown develoment VM
+I want changes cause be each scenario to be isolated
+(currently constuctor to freeze before and After hook roll back)
 
-Background:
+Background: have a running system
 	  Given a vagrant vm puppetsqueeze64 is running
-	  And the vm is frozen
 
 Scenario: access motd
 	  When the command cp /etc/motd /vagrant/motd.first is executed on the vm
@@ -21,6 +17,5 @@ Scenario: change motd
 	  Then the contents of motd.second should be FOO
 
 Scenario: access motd after change
-	  Given I rollback the vm                                   
           When the command cp /etc/motd /vagrant/motd.second is executed on the vm 
 	  Then the files motd.first and motd.second should be the same