http://blog.yellowback.net/archives/571-20120627.html
bundle intall:
Original does bundle install with gitlab user,
and gems are installed under vender/bundle>
But to adjust some install (by manually),
this (locally) handles on regular gem PATH.
Usually gem is installed onto
/usr/pkg/lib/ruby/gems/1.9.3/gems
but the one specified in Gemfile (like grit) is installed onto
/usr/pkg/lib/ruby/gems/1.9.3/bundler/gems
That is the reason why gem list won't list
