* add screenshots from Ubuntu config process
* add instructions for updating predeployed VMs
* add details on configuring mail server
* don't install test gems into prod
* no need for bundle exec
* small cleanups
* added RVM option for single-user install
* clarified Web Server options
* bluepill sample config: create socket directory if it doesn't exist
* add multisite.yml.production-sample
* rename production.sample.rb (OCD)
* make two database.yml samples (one for dev, one for prod)
* fixed travis build (database.yml.sample renamed)
* fix other references to database.yml.sample
* clean up 'rvm requirements' instructions as per @mpapis
