Accept Merge Request #11 : (hohoTT-dev -> dev)

Merge Request: 增加了公告的API接口和相应的API测试
Created By: @hohoTT
Accepted By: @virusdefender
URL: https://coding.net/u/virusdefender/p/qduoj/git/merge/11

oj/urls.py

@@ -4,6 +4,7 @@ from django.contrib import admin
 from django.views.generic import TemplateView
 
 from account.views import UserLoginAPIView, UsernameCheckAPIView, UserRegisterAPIView, UserChangePasswordAPIView
+from announcement.views import AnnouncementAPIView
 
 urlpatterns = [
     url("^$", TemplateView.as_view(template_name="oj/index.html"), name="index_page"),
@@ -16,6 +17,7 @@ urlpatterns = [
     url(r'^api/register/$', UserRegisterAPIView.as_view(), name="user_register_api"),
     url(r'^api/change_password/$', UserChangePasswordAPIView.as_view(), name="user_change_password_api"),
     url(r'^api/username_check/$', UsernameCheckAPIView.as_view(), name="username_check_api"),
+    url(r'^api/admin/announcement/$', AnnouncementAPIView.as_view(), name="announcement_api"),
     url(r'^problem/(?P<problem_id>\d+)/$', "problem.views.problem_page", name="problem_page"),
 
     url(r'^admin/contest/$', TemplateView.as_view(template_name="admin/contest/add_contest.html"), name="add_contest_page"),