need to to_a the Relation to execute SQL here
Merge pull request #8728 from amatsuda/model_all_returns_a_relation

A small fix for an AR test case
Adding a usage message to install.rb script

Previously, invoking the install.rb script with zero arguments
caused it to attempt to install all gems without a version
suffix, which would fail spectacularly. Failing gracefully with
a usage message is more helpful to a first-time user.
Merge pull request #8729 from timraymond/help_message_for_install_script

Adding a usage message to install.rb script