Add `.binstubs` to the PATH.
Add `.binstubs` to the PATH.

I dropped rvm a few days ago, so shell won't add append BUNDLE_BIN path to the
PATH when changing directories. And I always use `--binstubs=.binstubs`
option for bundler. So it will be great to add `.binstubs` to the PATH.
Thank god I won't type `bundle exec` or its alias `be` any more.

larrylv/dotfiles,sakishum/dotfiles-2,larrylv/dotfiles,sakishum/dotfiles-2,sakishum/dotfiles-2