Fixing theme switching (#277)

Something in Flask 0.12 changed the behavior of Jinja templates. There
are a couple open issues about it
https://github.com/pallets/flask/issues/1907

CTFd/models.py

@@ -37,7 +37,7 @@ class Pages(db.Model):
         self.html = html
 
     def __repr__(self):
-        return "<Pages {0} for challenge {1}>".format(self.tag, self.chal)
+        return "<Pages route {0}>".format(self.route)
 
 
 class Containers(db.Model):

CTFd/utils.py

@@ -144,6 +144,10 @@ def init_utils(app):
             if session['nonce'] != request.form.get('nonce'):
                 abort(403)
 
+    @app.before_request
+    def disable_jinja_cache():
+        app.jinja_env.cache = {}
+
 
 @cache.memoize()
 def ctf_name():