New tag system

  - Cleaned up documentation in some areas
  - New tag system
      Tags are now replaced by having a named tag after the attribute.
       
        Old usage:
          color: /* {{tag}} */#FFFFFF/* {{/tag}} */
         
        New usage:
          color: #FFFFFF; /* t:tag */
         
        Do not use spaces in tags, instead seperate words with -
          Example: body-color-tag
  - Added cleanstate-tag subtheme to demonstrate tag replacement