Add guard to bundler plugin's wrapped commands

plugins/bundler/bundler.plugin.zsh

@@ -6,7 +6,7 @@ alias bp="bundle package"
 
 # The following is based on https://github.com/gma/bundler-exec
 
-bundled_commands=(cap capify cucumber heroku rackup rails rake rspec ruby shotgun spec spork thin unicorn unicorn_rails)
+bundled_commands=(cap capify cucumber guard heroku rackup rails rake rspec ruby shotgun spec spork thin unicorn unicorn_rails)
 
 ## Functions