[MISC] Remove the defaults variable file
[TASK] Use a Sass map for the brand color variable
[MISC] Remove the box-sizing polyfill for IE7 and below
[DOCS] Fix a typo
[TASK] Move the wrapper elements for the siteContent area into the template corresponding files
[DOCS] Fix a typo
[TASK] Use a Sass map for the default button variables
[TASK] Use a Sass map for the default textInput variables
[MISC] Code style consistency
[MISC] Renamed the 'color' key in the 'textInput' map into the consistent 'textColor' name
[MISC] Code consistency
[TASK] Use an Sass map for the default headings styles
[MISC] Code style consistency
[FEATURE] Add a custom Sass function to remove multiple keys from a Sass map at once
[MISC] Remove deprecated mixins which flood the stylesheet with vendor prefixes
[DOCS] Fix a typo
[FEATURE] Add 'autoprefixer' to the grunt workflow