Add .custom-btn-icon description and code
Partial: Add .custom-gtn-icon example

Missing Font Awesome
Missing the examples! (series of buttons)
Add Font Awesome
Add .custom-btn-icon example and LESS code

Minor add .custom-nav-tabs-with-font-awesome-icon for .nav-list
Merge branch 'gh-pages-feature-add-custom-btn-icon' into gh-pages