Fix #866: Route not found

If we mount a Grape::API app which using version and namespaces to another
Grape::API app, the version setting will lost.

lib/grape/endpoint.rb

@@ -99,7 +99,6 @@ def reset_routes!
  def mount_in(route_set)
  if endpoints
  endpoints.each do |e|
- e.inheritable_setting.inherit_from inheritable_setting
  e.mount_in(route_set)
  end
  else

spec/grape/api_spec.rb

@@ -2415,6 +2415,21 @@ def static
  options '/v1/apples/colour'
  expect(last_response.status).to eql 204
  end
+
+ it 'mounts a versioned API with nested resources' do
+ class User < Grape::API
+ version 'v1'
+ resources :users do
+ get :hello do
+ 'hello users'
+ end
+ end
+ end
+ subject.mount User
+
+ get '/v1/users/hello'
+ expect(last_response.body).to eq('hello users')
+ end
  end
  end