restructuring Sass files
Big refactor: laid out Sass files in better structure, BEMed the CSS, added better example content.
renaming file to meet sass convention, updating readme
Fixed mistake where default template has "js" class hard coded in.  Moved it to being added by JS
Added reference to new JS file
updated responsive images JS to stop double image loading
Site title is conditionally a h1 tag if added onto the home page