Add 'bundle update --group' option
--path changes directory where 'vendor/cache' is created
Tests for package --path and --gemfile
Make bundler display post_install_message's for gems installed via :git
Remove not necessary false
Merge pull request #2731 from banyan/update-with-group

Add 'bundle update --group' option
avoid definition creation without groups
Merge pull request #2759 from gjaldon/add-package-options

Add --path and --gemfile opts to package