ここで循環エラーが発生します：
Bundler::GemspecError: Could not read gem at /path/to/website/vendor/cache/ruby/2.1.0/cache/libv8-3.16.14.7-x86_64-darwin-14.gem. It may be corrupted.
An error occurred while installing libv8 (3.16.14.7), and Bundler cannot continue.
Make sure that `gem install libv8 -v '3.16.14.7'` succeeds before bundling.
$ gem install libv8 -v '3.16.14.7'
Successfully installed libv8-3.16.14.7-x86_64-darwin-14
/Users/snowcrash/.rvm/gems/ruby-2.1.5/gems/rdoc-4.0.1/lib/rdoc/markdown.rb:15931: warning: encountered \r in middle of line, treated as a mere space
Parsing documentation for libv8-3.16.14.7-x86_64-darwin-14
Done installing documentation for libv8 after 0 seconds
1 gem installed
$ bundle install --path vendor/cache
... many lines here ...
Using koala (1.10.1)
Bundler::GemspecError: Could not read gem at /path/to/website/vendor/cache/ruby/2.1.0/cache/libv8-3.16.14.7-x86_64-darwin-14.gem. It may be corrupted.
An error occurred while installing libv8 (3.16.14.7), and Bundler cannot continue.
Make sure that `gem install libv8 -v '3.16.14.7'` succeeds before bundling.
助言がありますか？
====更新
すべてのキャッシュデータを削除しようとしたところrm -rf ~/.rvm/gems/ruby-2.1.5/cache/、bundle install --path vendor/cache次のようになりました。
Bundler::GemspecError: Could not read gem at /path/to/website/vendor/cache/ruby/2.1.0/cache/libv8-3.16.14.7-x86_64-darwin-14.gem. It may be corrupted.
An error occurred while installing libv8 (3.16.14.7), and Bundler cannot continue.
Make sure that `gem install libv8 -v '3.16.14.7'` succeeds before bundling.