Update urls to support viewing diffs in html kylef-archive#18

Author: Derecho

pasteapp/urls.py

@@ -13,7 +13,7 @@
     url('^paste/$', AddSnippetView.as_view()),
     url('^syntax/$', SyntaxView.as_view()),
     url('^(?P<slug>[\w\d]+)/delete/$', DeleteSnippetView.as_view()),
-    url('^(?P<a>[\w\d]+)\.\.\.(?P<b>[\w\d]+)$', DiffView.as_view()),
+    url('^(?P<a>[\w\d]+)\.\.\.?(?P<b>[\w\d]+)/?$', DiffView.as_view()),
     url('^$', IndexView.as_view()),
     url('^u/(?P<slug>[\w\d]+)/$', UserView.as_view()),
     url(r'^browserid/', include('django_browserid.urls')),