Use the standard Vaprobash way to install global Node packages.

Vagrantfile

@@ -67,10 +67,8 @@ symfony_root_folder   = "/vagrant/symfony" # Where to install Symfony.
 
 nodejs_version        = "latest"   # By default "latest" will equal the latest stable version
 nodejs_packages       = [          # List any global NodeJS packages that you want to install
-  #"grunt-cli",
-  #"gulp",
-  #"bower",
-  #"yo",
+  "bower",
+  "ember"
 ]
 
 sphinxsearch_version  = "rel22" # rel20, rel21, rel22, beta, daily, stable

scripts/environment.sh

@@ -6,7 +6,7 @@ sudo apt-get install -y phantomjs zsh exuberant-ctags
 mkdir /home/vagrant/npm
 mkdir -p /vagrant/flarum/core
 sudo chown -R vagrant:vagrant /home/vagrant
-npm install -g bower ember
+
 cp /vagrant/scripts/aliases ~/.aliases
 
 ### Create rc file ###