Make it easier to configure VMs for building OpenWRT

Currently, we use Ubuntu 14.04 and install the following dependencies:

```
sudo apt-get install make gcc g++ subversion unzip libncurses5-dev libncursesw5-dev ncurses-doc zlib1g-dev libssl-dev gettext --yes
```

It would be nice if we had this in a Vagrantfile or similar and a way to easily deploy to Digital Ocean.
