Fixed gridconfig, updated the test UI

Updated my prototype page to something a bit fancier. Some nice jQuery
to make the smooth appearing boxes.
Getting to the tricky layouting now.
Need to make the top ones fit if the number of cols/rows is weird.
Square numbers work well now and aren’t broken with large numbers of
players (I just didn’t update the experiment json whom adding more
streams)
using multiple instances of the same stream in one player does some
weird things, but that should be ok.