show story creation time in details view

ui/constants.py

@@ -1,6 +1,7 @@
 palette = [
     ('atm_section', 'white,bold', 'dark blue'),
     ('author', 'bold,dark blue', ''),
+    ('timestamp', 'underline', ''),
     ('custom_fields', 'dark red', ''),
     ('header', 'bold,light green', ''),
     ('project', 'yellow', ''),

ui/task_details.py

@@ -75,7 +75,11 @@ class CustomFields(object):
 class Stories(object):
     def __init__(self, stories):
         components = [
-            urwid.Text([('author', s.creator())] + s.text())
+            urwid.Text([
+                ('timestamp', s.created_at().strftime('%Y-%m-%d %H:%M')),
+                ' ',
+                ('author', s.creator()),
+            ] + s.text())
         for s in stories]
 
         self.stories = urwid.Pile(components)