Load rubygems in environment.rb [GH-781]

CHANGELOG.md

@@ -1,3 +1,8 @@
+## 1.0.1 (unreleased)
+
+  - Add missing `rubygems` require in `environment.rb` to avoid
+    possible load errors. [GH-781]
+
 ## 1.0.0 (March 6, 2012)
 
   - `vagrant gem` should now be used to install Vagrant plugins that are

lib/vagrant/environment.rb

@@ -2,6 +2,7 @@ require 'pathname'
 require 'fileutils'
 
 require 'log4r'
+require 'rubygems'  # This is needed for plugin loading below.
 
 require 'vagrant/util/file_mode'
 require 'vagrant/util/platform'