v1.3.0

• Added support for a Firefox add-on
• Used Sass in favor or plain CSS for styles
• Converted HAML files to HTML
• Installed ans Bootstrap as an NPM package
• Bumped karma-chrome-launcher to 3.2.0
• Bumped webpack-merge to 6.0.1
• Added instructions on shipping a new release
• Updated the logos
• Added a help text in the sign-in page that includes a link to an article on how to generate/get a Screenly token.