Issue #10: Add an options menu to oopstab that is accessible from the about:addons
screen.
(No Issue): Added en-US locale.
Issue #10: Remove install.rdf in favor of package.json, which does the same thing and offers more powerful commands.
Merge branch 'master' into issue-10
Issue #10: Add back prefloader.js code so that oopstab can remove preferences upon exit.