Helper#icon prepends fa- to multiple classes, to get <i class='fa fa-…

…flag fa-2x'> now we can do:

- icon('flag 2x')
- icon([:flag, '2x'])

lib/font_awesome/sass/rails/helpers.rb

@@ -5,8 +5,8 @@ module ViewHelpers
         def icon(icon, text = nil, html_options = {})
           text, html_options = nil, text if text.is_a?(Hash)
 
-          icons = icon.split(" ").map { |icon| "fa-#{icon}" }.join(" ")
-          content_class = "fa #{icons}"
+          icons = icon.is_a?(Array) ? icon : icon.to_s.split(' ')
+          content_class = "fa #{icons.map { |i| "fa-#{i}" }.join(' ')}"
           content_class << " #{html_options[:class]}" if html_options.key?(:class)
           html_options[:class] = content_class