Add example box.conf.yaml file to customize the nooku/box instance

See ticket 281 on the nooku-server space (https://nooku.assembla.com/spaces/nooku-server/tickets/cardwall#/ticket:281).
Merge branch 'develop' of https://github.com/nooku/nooku-platform into develop

Conflicts:
	.gitignore
Rename box.conf.yaml-dist to box.config.yaml-dist
Add Varnish notes and VM configuration instructions to README