Adding Ubuntu 12.02 LTS VagrantFile with shell Provisioner installer for  w3af_console.

A friend was having issues getting the dependencies right, primarily because his system was using older Ubuntu Python packages. I wrote up this for him, then decided to make a VagrantFile. To use:

    git clone --depth 1 https://github.com/andresriancho/w3af.git
    cd w3af
    vagrant up

Interactive Ubuntu 12.02 LTS install directions which may be useful for the docs:

    sudo apt-get update -y
    # Install basic requirements, python-lxml because it doesn't compile correctly from pip (why? idk)
    sudo apt-get install -y python-dev git python-lxml
    # Get and install pip
    wget https://bootstrap.pypa.io/get-pip.py
    sudo python get-pip.py
    git clone --depth 1 https://github.com/andresriancho/w3af.git
    cd w3af
    ./w3af_console
    sudo /tmp/w3af_dependency_install.sh
    ./w3af_console

*Ubuntu Python doesn't like running from a symbolic link, so the script re-clones the repo.*