Fixed support multiple API versions

Author: Drakula2k

lib/grape-swagger.rb

@@ -46,7 +46,7 @@ def self.setup(options)
             }
             options = defaults.merge(options)
 
-            @@target_class = options[:target_class]
+            target_class = options[:target_class]
             @@mount_path = options[:mount_path]
             @@class_name = options[:class_name] || options[:mount_path].gsub('/','')
             @@markdown = options[:markdown]
@@ -59,7 +59,7 @@ def self.setup(options)
             get @@mount_path do
               header['Access-Control-Allow-Origin'] = '*'
               header['Access-Control-Request-Method'] = '*'
-              routes = @@target_class::combined_routes
+              routes = target_class::combined_routes
 
               if @@hide_documentation_path
                 routes.reject!{ |route, value| "/#{route}/".index(parse_path(@@mount_path, nil) << '/') == 0 }
@@ -87,8 +87,8 @@ def self.setup(options)
               header['Access-Control-Allow-Origin'] = '*'
               header['Access-Control-Request-Method'] = '*'
               models = []
-              routes = @@target_class::combined_routes[params[:name]]
-              routes_array = routes.map { |route|
+              routes = target_class::combined_routes[params[:name]]
+              routes_array = routes.map {|route|
                 next if route.route_hidden
                 notes = route.route_notes && @@markdown ? Kramdown::Document.new(strip_heredoc(route.route_notes)).to_html : route.route_notes
                 http_codes = parse_http_codes route.route_http_codes