512Mo is not enough

* Add more memory to vbox

Vagrantfile

@@ -7,7 +7,7 @@ Vagrant.configure("2") do |config|
 
   config.vm.provider :virtualbox do |vb|
     vb.customize ["modifyvm", :id, "--natdnshostresolver1", "on"]
-    vb.customize ["modifyvm", :id, "--memory", 512]
+    vb.customize ["modifyvm", :id, "--memory", 1024]
     vb.customize ["modifyvm", :id, "--cpus", 2]
   end