Created by: saas786
Font related variable movements. Also added missing variables to customizer and fixed inconsistent data between variables.less and customize.html.
@mdo & @cvrebert please have a look and let me know if got errors.
Note: I tested locally and did grunt with success.
Sorry about length of pull request, I wish I could send it in small pull requests but I can't (because of my current work load). So I spent full day on this so we can quickly move onto Final Release.