CRAN Package updates

The package updates are triggered by a cron task that runs on the Crantastic VPS. The update procedures are stored in lib/crantastic.rb, and uses ActiveResource to send the updates to the live server (Heroku). The cron entry and update scripts are run by the crantastic user on the VPS. Note that this user use a full checkout of the crantastic source tree to run the updates. The cron task runs git pull, though, so the latest version of the code should always be present on the VPS without manual intervention.