layers, and not load by default if the layer is not visible. Includes tests.
Default Behavior can be changed with
'OpenLayers.Strategy.Fixed.prototype.preload=true;'. With review from elemoine,
comments from tschaub, review from me. Patch by Edgemaster. (Closes#1852)
git-svn-id: http://svn.openlayers.org/trunk/openlayers@8775 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf