Use precise64 for all fixtures

Should be easier to run the acceptance tests as we now only need to get
1 box instead of 2 before.

spec/acceptance/fixtures/auto-detect-with-provisioning.rb

@@ -4,6 +4,6 @@ Vagrant.configure("2") do |config|
   config.cache.auto_detect = true
   config.cache.scope = :machine
 
-  config.vm.box = 'raring64'
+  config.vm.box = 'precise64'
   config.vm.provision :shell, inline: 'apt-get update && apt-get install -y git'
 end

spec/acceptance/fixtures/auto-detect.rb

@@ -2,6 +2,6 @@ Vagrant.require_plugin 'vagrant-cachier'
 Vagrant.require_plugin 'vagrant-lxc'
 Vagrant.configure("2") do |config|
   config.cache.auto_detect = true
-  config.vm.box = 'quantal64'
+  config.vm.box = 'precise64'
   config.vm.provision :shell, inline: 'echo Hello!'
 end

spec/acceptance/fixtures/no-cachier-simple.rb

@@ -1,5 +1,5 @@
 Vagrant.require_plugin 'vagrant-cachier'
 Vagrant.require_plugin 'vagrant-lxc'
 Vagrant.configure("2") do |config|
-  config.vm.box = 'quantal64'
+  config.vm.box = 'precise64'
 end

spec/acceptance/fixtures/no-cachier-with-provisioning.rb

@@ -1,6 +1,6 @@
 Vagrant.require_plugin 'vagrant-cachier'
 Vagrant.require_plugin 'vagrant-lxc'
 Vagrant.configure("2") do |config|
-  config.vm.box = 'quantal64'
+  config.vm.box = 'precise64'
   config.vm.provision :shell, inline: 'echo Hello!'
 end