2016-08-16 bundle install --path gems , bundle exec rake ... rake ... 違い bundle install --path gemshttp://ka-zoo.net/2013/07/difference-of-rake-xxx-and-bundle-exec-rake-xxx/ http://qiita.com/windhorn/items/0f58866291f8273f18fb http://qiita.com/shunsuke227ono/items/dbc7c3428bc0ac01e9ac