v4.0.0

Added

• theme.yml file which can be used to customize component default uswds colors and fonts
• ability to add a class to top and side navigational links
• site_width variable to config.yml for setting the site width to 100%
• theme demo page to show tables and buttons

Updated

• demo home page to use all markdown and not longer use HTML
• breakpoints for side nav to now switch to a small screen view at 960px instead of 1200px
• the default USWDS stylesheet included is now generated from Sass rather than using the minified CSS version