Update protocol relative regex

Author: remybach

app/helpers/requirejs_helper.rb

@@ -49,7 +49,7 @@ def requirejs_include_tag(name = nil, &block)
           if run_config.has_key? 'paths'
             # Add paths for assets specified by full URL (on a CDN)
             run_config['paths'].each do |k, v|
-              paths[k] = v if v.is_a?(Array) || v =~ /^(https?:|\/\/)/
+              paths[k] = v if v.is_a?(Array) || v =~ /^(https?:)?\/\//
 
             end
           end