Support mount-specific swagger_root and add swagger_filter setting

lib/swagger_rails.rb

@@ -1,33 +1,15 @@
-require "swagger_rails/engine"
+require 'swagger_rails/version'
+require 'swagger_rails/configuration'
 
 module SwaggerRails
 
-  class Configuration
-    attr_reader :swagger_docs, :swagger_dir_string
-
-    def initialize
-      @swagger_docs = {}
-      @swagger_dir_string = nil
-    end
-
-    def swagger_doc(path, doc)
-      @swagger_docs[path] = doc
-    end
-
-    def swagger_dir(dir_string)
-      @swagger_dir_string = dir_string
-    end
+  def self.configure
+    yield(config)
   end
 
-  class << self
-    attr_reader :config
-
-    def configure
-      yield config
-    end
-
-    def config
-      @config ||= Configuration.new
-    end
+  def self.config
+    @config ||= Configuration.new
   end
 end
+
+require 'swagger_rails/engine' if defined?(Rails)