Return enable symlinks in vagrant and use npm@3

Vagrantfile.example

@@ -8,6 +8,7 @@ Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|
   config.vm.provider "virtualbox" do |v|
     v.memory = 768
     v.cpus = 1
+    v.customize ["setextradata", :id, "VBoxInternal2/SharedFoldersEnableSymlinksCreate/vagrant", "1"]
   end
   config.vm.box = "thepeopleseason/habitrpg"
   config.ssh.forward_agent = true

vagrant_scripts/install_node.sh

@@ -16,7 +16,7 @@ nvm use
 nvm alias default current
 
 echo Update npm...
-npm install -g npm@2
+npm install -g npm@3
 
 echo Installing global modules...
 npm install -g gulp bower grunt-cli mocha