Adding vagrant-cachier and updating to latest CentOS 6.4 box.

Vagrantfile

@@ -16,11 +16,11 @@ Vagrant.configure("2") do |config|
 	# please see the online documentation at vagrantup.com.
 
 	# Every Vagrant virtual environment requires a box to build off of.
-	config.vm.box = "centos64"
+	config.vm.box = "centos-6.4-x86_64"
 
 	# The url from where the 'config.vm.box' box will be fetched if it
 	# doesn't already exist on the user's system.
-	config.vm.box_url = "http://downloads.eox.at/boxes/centos64.box"
+	config.vm.box_url = "http://downloads.eox.at/boxes/centos-6.4-x86_64.box"
 
 	config.vm.hostname = "builder-rpm-vagrant"
 
@@ -48,6 +48,9 @@ Vagrant.configure("2") do |config|
 	config.vm.synced_folder "build/RPMS", "/home/vagrant/rpmbuild/RPMS"
 	config.vm.synced_folder "build/SRPMS", "/home/vagrant/rpmbuild/SRPMS"
 
+	# Use package caching https://github.com/fgrehm/vagrant-cachier
+	config.cache.auto_detect = true
+
 	# Provider-specific configuration so you can fine-tune various
 	# backing providers for Vagrant. These expose provider-specific options.
 	# View the documentation for the provider you're using for more