Change CSS classes

-Make more logical; modal name for colour
-Change icons to use abbreviations as per .nr
Remove DLR clash

-Schoolboy error - use .docklands for DLR colour
Victoria line stations

-Pages for Walthamstow Central, Blackhorse Road, Tottenham Hale &
Finsbury Park
-Galleries WIP
-Finsbury Park prose probably needs re-visiting
-Includes Piccadilly page for Finsbury Park