requests will 'just work' if the file is loaded locally (which was only the
case before when using relative URLs). It also means that the examples better
document how to set ProxyHost, since they no longer depend on an undocumented
setting.
git-svn-id: http://svn.openlayers.org/trunk/openlayers@1216 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf