Entries added to census list

Closes #30

src/main/resources/templates/census/list.html

@@ -41,6 +41,9 @@
                     <a th:action="edit" class="btn btn-warning btn-sm"
                        th:href="'census/' + ${census.id} + '/edit'"
                        th:text="Edit"></a>
+                     <a th:action="entries" class="btn btn-info btn-sm"
+                        th:href="'census/' + ${census.id} + '/entries'"
+                        th:text="Entries"></a>
                     </span></td>
             </tr>
             <tfoot>