Add 'show date in header' and 'show latest update time' options to Facia tool

Looks terrible, obviously, 'cuz I styled it:

Options in the tool
==============

![screen shot 2014-10-03 at 11 34 25](https://cloud.githubusercontent.com/assets/1001642/4504636/1426e7f0-4ae9-11e4-9a80-ad46385e4867.png)

Date on its own
============

![screen shot 2014-10-03 at 10 33 25](https://cloud.githubusercontent.com/assets/1001642/4504644/204e01e4-4ae9-11e4-83cd-dc9e489ff46d.png)

![screen shot 2014-10-03 at 10 33 40](https://cloud.githubusercontent.com/assets/1001642/4504645/25013fb2-4ae9-11e4-837b-5e0b9d3a48a1.png)

Date and latest update
==================

![screen shot 2014-10-03 at 11 28 54](https://cloud.githubusercontent.com/assets/1001642/4504646/2e37f594-4ae9-11e4-96fa-d2999414a2bf.png)

If it's not got enough room to show the update on one line, the time will move down onto the next line:

![screen shot 2014-10-03 at 11 29 03](https://cloud.githubusercontent.com/assets/1001642/4504649/3fc25980-4ae9-11e4-831a-2292e4018066.png)

Latest update isn't shown on mobile at the moment:

![screen shot 2014-10-03 at 11 29 12](https://cloud.githubusercontent.com/assets/1001642/4504651/48c453bc-4ae9-11e4-8117-c55075d4e9c4.png)

Latest update on its own
===================

![screen shot 2014-10-03 at 11 33 40](https://cloud.githubusercontent.com/assets/1001642/4504653/561abd3a-4ae9-11e4-93a6-7843608bd8bf.png)

![screen shot 2014-10-03 at 11 33 51](https://cloud.githubusercontent.com/assets/1001642/4504654/593f9a80-4ae9-11e4-81ab-0d5696d834dc.png)