Added several features

 - Layout width switch in page admin - allows for boxed pages
   (container) or 100% pages - useful for pages that have 100% elements.

 - Shortcodes: boxed, row, column, each take arguments id and class.
   boxed is used in 100% pages to create boxed content. Column takes
   type and width [column type=sm width=1]

 - Settings in the customize register for logo, header type (fixed,
   static) and search bar toggle.