bin/update: Use rails 5.0.0.1 bin/setup conventions in ours
bin/update: Use rails 5.0.0.1 bin/setup conventions in ours

The template is found here:
https://github.com/rails/rails/blob/v5.0.0.1/railties/lib/rails/generators/rails/app/templates/bin/update

The main change here is we remove our execute method for reporting failures and
use a nearly identical one added to rails: system!

Switch from execute to system! from rails

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