Finished the task build for Gruntfile.js

    modified:   Gruntfile.js
    modified:   app/control.html
    modified:   app/index.html
Added the plugin for firefox os

    modified:   Gruntfile.js
    new file:   app/images/logo.svg
    new file:   app/images/logo128.png
    new file:   app/images/logo60.png
    new file:   app/manifest.webapp