Sage 8.0.0

• Change theme name from Roots to Sage
• Bump required PHP version to >=5.4
• Add coding standards based on PSR-2
• Add Travis CI
• Add namespace
• Use short array syntax
• Use short echo syntax
• Switch from Grunt to gulp, new front-end development workflow
• Switch from Livereload to BrowserSync
• Use wiredep for Sass and Less injection
• Implement JSON file based asset pipeline with asset-builder
• Re-organize asset file structure
• Re-organize stylesheet file structure
• Add main.scss.example and instructions for using Sass
• Use the primary theme stylesheet for the editor stylesheet
• Remove theme activation, move to wp-cli-theme-activation
• Simplify 404 page
• Convert Sidebar to ConditionalTagCheck
• Update to jQuery 1.11.2
• Use new core navigation template tag
• Update sidebar to fix default template check
• Update nav walker to correctly assign active classes for custom post types
• Better support for CPT templates