CSS management via Settings PoC

This is a PoC of all CSS related config stories. 

 - OpenDirective/florence_win8#24
 - OpenDirective/florence_win8#30

Three new new CSS settings are provided. Click the "settings" button on the album page and then select "Look and Feel". Enter the name of a stylesheet you want to use. In the PoC we have:

 - light (demonstrates changing the colour scheme)
 - dark (demonstrates changing the colour scheme)
 - noIcons (demonstrates hiding icons intended to be icons)

We need new CSS to demo 

  - OpenDirective/florence_win8#25
  - OpenDirective/florence_win8#36

This patch also provides a very rudimentary settings feature, which allows a facilitator or user to customise their experience (OpenDirective/florence_win8#34). Settings are not currently persisted.