increased visibility of London IMC RSS feed

Just before the start of the last meeting, Anthony had asked me if it would be possible to display a block on the sidebar of London IMC headlines from its RSS feed.

We already displayed headlines from the London IMC mixed in with headlines from other Indy Media sites.  Also users with accounts have always been able to enable the displaying of London IMC headlines in their account settings. 

Initially I didn't give the London IMC its own block because there were never any new stories.  But as Anthony suggested that's changed now.

The meeting itself was a little chaotic because we didn't have quorum right away and it was a little noisy at the bar, so Anthony's suggestion about the London IMC block didn't make the agenda.

I did it anyways figuring nobody would have any objections.  If anyone does, post them here and the block will be hidden by default again until it can be discussed at a meeting.

Jeremy