Add default Vagrantfile by running 'vagrant init'
Set base box to Ubuntu
Add shell provisioning for vm
Re-add network-related config
Add template for DHCP
Enable private network
Clarify vm folder is for plain template for Vagrant
Add vagrant bootstrap file for OTP
Provision as user vagrant, not root
Document how to disable default share e.g. for issues in mounting
Explicit network auto-config

In some tricky configs e.g. bridge for Xen you may need to disable it
afterwards.
Prefer DHCP in order to avoid IP clashes
Add script for packing box to upload on cloud/atlas
Disable default share - may time out when playing with network
Disable network - SSH to and pinging Internet from the VM work anyway

If the IP of the box is not needed and a TCP port is enough, forward
port works.
Add Xen - for Erlang on Xen

The trickiest part is the setup of the network bridge without messing
up Vagrant's `eth0`, especially after reboot.

Also refactor provisioners style.
Polish Xen bootstrap
Align OTP bootstrap to the Xen one
Provision both Xen and OTP - for LING
Optimize OTP download