introduce REST API

add djangorestframework add serializers for select models create api urls extend EventSlugMixin to work for list and create methods create list and retrieve viewsets for select models include AKModel URLS into main app

closes #64 (closed)

AKModel/serializers.py

+from rest_framework import serializers
+
+from AKModel.models import AK, Room, AKSlot, AKTrack, AKCategory, AKOwner
+
+
+class AKOwnerSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = AKOwner
+        fields = '__all__'
+
+
+class AKCategorySerializer(serializers.ModelSerializer):
+    class Meta:
+        model = AKCategory
+        fields = '__all__'
+
+
+class AKTrackSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = AKTrack
+        fields = '__all__'
+
+
+class AKSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = AK
+        fields = '__all__'
+
+
+class RoomSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = Room
+        fields = '__all__'
+
+
+class AKSlotSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = AKSlot
+        fields = '__all__'