Resurrection of the calculator app that was pulled from gaia.
If you plan to create, update, or destroy any files, please make sure to update the zip.
zip app/application.zip newfile.whatever # add a new file into the zip zip -f app/applicaton.zip # Rezip modified contents aka freshen zip -d app/application.zip garbage.whatever # remove a file from the zip
Note: updating the zip is unnecessary if you're developing with the Firefox OS Simulator (Recommended). With the simulator, you can install as a packaged app by clicking Add Directory, then browsing to the manifest.webapp.