Include index.js in NPM

A minor update that ensures the required index.js file is included with npm installs.

Now with SaSS support

SaSS support has been added to the repo. You can read more about that here:
https://github.com/mozilla/tabzilla/#using-tabzilla-with-sass

Install Tabzilla with NPM

This release includes:

• Image file size optimisation
• Added some additional items to the ignore list so, smaller package
• Some README updates
• Change PNG reference to relative instead of absolute
• Added MPL 2.0 License
• You can now install Tabzilla via npm

See the docs for more and a big thank you to everyone who contributed to this release.

Tabzilla Static

This is the first release of the new Mozilla universal tab aka Tabzilla, that you can use on your website. This initial version is a static ribbon across the top of your webpage, with the option to change the wordmark color to better fit the color scheme of your site.

Tabzilla can now be integrated into your site by downloading the source from the releases page or, installing it as a bower package. See the README for more details.