update bundled commands

plugins/bundler-exec/bundler-exec.plugin.zsh

 # This plugin is based on https://github.com/gma/bundler-exec
 # modify the bundled_commands if needed
 
-bundled_commands=(cucumber heroku rackup rails rake rspec ruby shotgun spec spork)
+bundled_commands=(cap capify cucumber heroku rackup rails rake rspec ruby shotgun spec spork thin unicorn unicorn_rails)
 
 ## Functions