RiotGames/berkshelf — pull request #385 by reset (2013-02-26 03:33:44+00:00)
Title: add helpful error message for loading the berkshelf plugin

this should help eliminate confusion for users who have installed Vagrant via the pre-packaged installer. This information will be updated when Vagrant 1.2 comes out with the new gem install command (plugin install). The rubygems bit should be removed when 1.2 comes out as well since Vagrant will no longer be packaged as a gem.