Upgrade Vagrantfile for use with vagrant >=1.1

Fixes #442

Vagrantfile

@@ -1,4 +1,4 @@
-Vagrant::Config.run do |config|
+Vagrant.configure("2") do |config|
   config.vm.box = "lucid64"
   config.vm.host_name = "barkeep-vagrant"
   config.vm.box_url = "http://files.vagrantup.com/lucid64.box"
@@ -7,12 +7,12 @@ Vagrant::Config.run do |config|
 
   # Forward a port from the guest to the host, which allows for outside
   # computers to access the VM, whereas host only networking does not.
-  config.vm.forward_port 80, 8080
-
-  # More memory than the default, since we're running a lot of stuff (1GB)
-  config.vm.customize ["modifyvm", :id, "--memory", 1024]
+  config.vm.network "forwarded_port", guest: 80, host: 8080
 
   # Have ssh be accessible through port 2250. Hard coding this so we don't collide with other vagrant vms.
-  config.vm.forward_port 22, 2250
+  config.vm.network "forwarded_port", guest: 22, host: 2250
   config.ssh.port = 2250
+
+  # More memory than the default, since we're running a lot of stuff (1GB)
+  config.vm.provider("virtualbox") { |vb| vb.customize ["modifyvm", :id, "--memory", 1024] }
 end