Enable ETL

Created by: slifty

This PR enables support for automated setup and execution of ETL processes for competitions. This means it allows for automatic downloading of data and utilities from an OTS (or OTS compatable) SVN repository as well as the necessary tools to eventually run the deploy scripts hosted in torque-sites.

The new environment variables that are documented in the installation steps / template files are optional, and if they are ignored then setup will still work but will not support ETL.

It also includes a small commit which sets up the DemoView competition (with no data)