adding personalisable StructBlock for in-page personalisation

src/personalisation/blocks.py

@@ -0,0 +1,12 @@
+from wagtail.wagtailcore import blocks
+from personalisation.models import Segment
+
+class PersonalisedStructBlock(blocks.StructBlock):
+
+    if Segment.objects.count() > 0:
+    	segment = blocks.ChoiceBlock(choices=[
+            (segment.pk, "{} ({})".format(segment.name, segment.status) ) \
+                for segment in Segment.objects.all()
+        ], required=False, label="Personalisation segment",
+        help_text="Only show this content block for users in this segment")
+