Alternative 'bundle' syntax.

[jdickey]

Especially given that not everyone (yet) uses RVM or rbenv, it would be a Good Thing™ to have the option of bundling Gems underneath the vendor directory; i.e., the equivalent of the command line bundle install --path vendor. Doing so would eliminate the need to a) ask for a password to install Gems and b) keep from polluting the system Gem repository with Gems used only on a single project or small subset of projects.

It would also be Very Nice if 'bundle install', instead of erroring out when a needed Gem is not already installed, would instead install that Gem.