Minor update to map

Hello all. I've performed a minor update to the map so that the map markers are clustered. This makes it easier to see where the concentrations of images are and clearly shows that most of the cards Stuart issued were of images taken in the Southampton area. Check it out on the map page.

I've been steadily adding cards as time permits, at the moment I still have about 150 to add, including all the portrait orientated ones which I have not quire worked out how to deal with yet!