Merge branch 'chiaki_dev' into zemal_dev

* chiaki_dev:
  fix ci
  Add submission module

# Conflicts:
#	requirements.txt

submission/serializers.py

@@ -0,0 +1,8 @@
+from utils.api import serializers
+from judge.languages import language_names
+
+
+class CreateSubmissionSerializer(serializers.Serializer):
+    problem_id = serializers.IntegerField()
+    language = serializers.ChoiceField(choices=language_names)
+    code = serializers.CharField(max_length=20000)