Basic clean up and organizing Sass

Does not affect styling but clears out a lot of extra cruft and
organizes styles into relevant files.

More logical groupings and consistency between properties.

Getting rid of manual prefixes to take advantage of Grunt-autoprefixer
where possible.
Clean up hard coded font references
Cleaning up hard coded fonts across all Sass files

Also added a few helpful links to the header of the index.scss file for
Contributors and cleaned up a few other miscellaneous bits.
Exposing more sneaky hard coded fonts to the lovliness of Sass
Merge branch 'pr/667' into develop

* pr/667:
  Exposing more sneaky hard coded fonts to the lovliness of Sass
  Cleaning up hard coded fonts across all Sass files
  Clean up hard coded font references
  Basic clean up and organizing Sass