Resolve "Show guardians and children on person view"

Closes #288 (closed)

aleksis/core/templates/core/person/collection.html

+<div class="collection">
+  {% for person in persons %}
+    <a class="collection-item" href="{% url "person_by_id" person.pk %}">
+      <i class="material-icons left">person</i>
+      {{ person }}
+    </a>
+  {% endfor %}
+</div>