Merge pull request #43 from chixor/master

Responsive layout
Bump CSS version
Pngcrush background image
Pngcrush london.png while I'm at it
Fetch flickr photos async and cache them.
Include rather than require
Remove old flickr code
Move this inside the div
Replace google map with static map using API key
Protocol-independent URL
CSS revision bump
Re-order columns in HTML to be logical on smaller screens.
CSS version bump
Send charset
Make menu work with JS disabled
Tweak menu copy
Add missing menu items
Add a join button to the header
Fix expanding flickr container
workaround rare http 504 errors