Roots 7.0.0

• Updated Grunt workflow
• Use grunt-modernizr to make a lean Modernizr build
• Use Bower for front-end package management
• Update to Bootstrap 3.2.0
• Updage to Modernizr 2.8.2
• Update to jQuery 1.11.1
• Move clean up, relative URLs, and nice search to Soil
• Update LESS organization
• Move community translations to separate repository