With a pure javascript plugin, dropping a new file in the plugins/
directory and reloading the page is sufficient to see changes.
However, with .jar plugins (as zuul-summary-plugin now is) you need to
actually issue a reload, which requires the included permissions.
Enable it dev mode, which is where you'll very likely be trying to
iterate development with a change to a plugin. I don't think it's
really that dangerous for production, but traditionally it's been off
there so let's leave it like that.
While we're here, write out a little script to help you quickly deploy
a new .jar of the plugin when we're testing.
Change-Id: I57fa18755f8a8168da12c48f1f38d272da1c6599
58ba847c07