Stop using custom AMI and use standard Ubuntu AMI

Vagrantfile

@@ -119,10 +119,11 @@ end
     aws.keypair_name = ENV["AWS_KEYPAIR_NAME"]
     aws.ssh_private_key_path = ENV["AWS_SSH_PRIVKEY"]
     aws.region = "us-east-1"
-    aws.ami = "ami-4e75ee27"
+    aws.ami = "ami-ae9806c7"
     aws.ssh_username = "ubuntu"
     aws.instance_type = "t1.micro"
   end
+
   config.vm.provider :rackspace do |rs|
     config.vm.box = "dummy"
     config.vm.box_url = "https://github.com/mitchellh/vagrant-rackspace/raw/master/dummy.box"
@@ -133,6 +134,7 @@ end
     rs.flavor   = /512MB/
     rs.image    = /Ubuntu/
   end   
+
   config.vm.provider :virtualbox do |vb|
     config.vm.box = "quantal64_3.5.0-25"
     config.vm.box_url = "http://get.docker.io/vbox/ubuntu/12.10/quantal64_3.5.0-25.box"