Non-secure host for football snaps

Snaps currently use a secure host for ajaxing in. 

http -> https makes IE9 unhappy (http://frontend.errors.guim.co.uk/guardian/frontend/group/3258/)

Snaps now use insecure ajax host

@jamesgorrie, looks like the preview snap is pulled in from scala, so should be ok to just use the insecure version everywhere?