Swap to using single backend call to get the corners.

This is nicer than four separate calls.

Change-Id: I0379ee4d470b402375398fe162f7aa9bd9a1c33a
Add the right streams and BATC logo link.

This adds the BATC streams, their logos and a mechanism to choose
between the streams. We default to loading arena A, but the links
above the stream box let the user swap this out for arena B.

This is currently assumes that stream 'sr20141' is of arena A.

Change-Id: I3179514a482c15007abd38b73a1544cf69463017
Add missing BATC streaming logo.

I failed to include this in 531e402dab68.

Change-Id: I2b7fcb42fbfba110e0a379bfc3576d98962a0ead
Implement Rich's front page design.

This adds a local template for the match infos and then uses that
for the current and a couple of upcoming matches. We move the twitter
stream down as that's not very interesting really.

The only tweak over Rich's design that I've done here is to put the
table header cells in the middle, rather than on the left, which I
think works well.

Also move the leaderboard slightly to the right so that the top stuff
doesn't end up looking like it's much wider than it should be.

Change-Id: I8bef259e80f36e24df2b1227523d48c6a45ead48