This apt-get update is slow -- no need to execute it all the time

Author: bjori

scripts/ubuntu/essentials.sh

@@ -1,8 +1,10 @@
-# Tools you can't live without
-apt-get update
-apt-get install -y build-essential git vim
-
-# I can't stand emacs
-echo 'set -o vi' | sudo tee /etc/profile.d/vishell.sh
+if [ ! -e ".provisioned" ]; then
+	# Tools you can't live without
+	apt-get update
+	apt-get install -y build-essential git vim
 
+	# I can't stand emacs
+	echo 'set -o vi' | sudo tee /etc/profile.d/vishell.sh
 
+	touch .provisioned
+fi