Fix file system permissions for `conference.ics`
Mark this project as a private `npm` package

Ref: https://www.npmjs.org/doc/files/package.json.html#private
Use `Autoprefixer`

Ref: https://github.com/nDmitry/grunt-autoprefixer
     https://github.com/ai/autoprefixer
Load Grunt tasks automatically
Specify `<meta charset>` tag as early as possbile

For more information on why this is important see:
https://github.com/h5bp/html5-boilerplate/blob/973b8453ded68af1d9c833d4ad4312e6c63ccbeb/doc/html.md#the-order-of-the-title-and-meta-tags