Fix Swallow to upgrade / work with Rails4

* Remove puts statement that caused swallow to break.  (Damn it @bosoxbill!).
* Instead of installing new versions of ruby n times on each app server (where n is the number of app servers) only install the new version of ruby once on each app server.
* Instead of depending on whenever/capistrano link the whenever tasks directly.  This makes it so whenever will always run after bundle installs (on upgrading ruby, the new version of ruby doesn't have whenever installed when the task was running and was causing it to fail.  By specifying to do the whenever stuff after the code is updated we don't have to worry about this).
* Bump version to 4.0.0