Build quantal 64 box with new json metadata

boxes/quantal-64/metadata.json

@@ -0,0 +1,9 @@
+{
+  "provider":            "lxc",
+  "vagrant-lxc-version": "0.0.1",
+
+  "template-opts": {
+    "--arch":    "x86_64",
+    "--release": "quantal"
+  }
+}

tasks/boxes.rake

@@ -18,5 +18,20 @@ namespace :boxes do
       sh 'rm -f output/ubuntu-cloud.box'
       sh 'cd boxes/ubuntu-cloud && tar -czf ../output/ubuntu-cloud.box ./*'
     end
+
+    desc 'Build Ubuntu Quantal x64 Vagrant LXC box'
+    task 'quantal-64' do
+      unless File.exists?('/var/cache/lxc/quantal/rootfs-amd64')
+        puts "Right now you need to run `lxc-create` with the right arguments to build debootstrap's cache " +
+             "prior to building the box.\n" +
+             "Please contact me at the mail you'll find at https://github.com/fgrehm/vagrant-lxc/issues\n" +
+             "if you want to find out how to get this going."
+        exit 1
+      end
+
+      sh 'mkdir -p boxes/output'
+      sh 'rm -f output/lxc-quantal-64.box'
+      sh 'cd boxes/quantal-64 && tar -czf ../output/lxc-quantal-64.box ./*'
+    end
   end
 end