Enhanced Deploy Suite which will handle all artefacts + Varnish

The deploy scripts now only need to be installed on a single host, and can operate all other hosts remotely. This will simplify installation. 

I removed anything to do with purging databases/solr. That seemed dangerous and should be handled as a one-off task as required.

Also, included is the ability to manipulate a Varnish cache as each Front is stopped/started & warmed before being put back into the pool.

I removed the dependancy on host names, as this seemed too fragile.

I've changed the config file a bit to include a few more parameters and deleted the irrelevant ones. There are only two examples now. polpolydev & polopolydev2 (OSX).

Changed the doco a bit to describe setting up the Unix system requirements.

Added the ability to deploy tomcat config from a central location.

Clear down JBoss Artefacts between deploys, just in case of version change.