added automated install script for Ubuntu

This is still being tested; references gh-2

* installed vanilla ubuntu 12.04 server
* chose default options; did not install any additional packages or configure server
* after install 
```
wget path/to/ghgvc.sh
chmod u+x ghgvc.sh
sudo ./ghgvc.sh
```
* had to provide root mysql user and password (in the interest of security, this is okay!)