Fix zoom level jump bug.
Fix zoom level jump bug.

Always set the layer maxExtent to contain the world
for the Google Projection. Max extent influences calculations
in various parts of OpenLayers and should not be used to
limit what tiles are loaded.

markng/tilestream,makinacorpus/tilestream,simonpoole/tilestream,frankrowe/tilestream,zhm/tilestream,HydroLogic/tilestream,simonpoole/tilestream,HydroLogic/tilestream,mapbox/tilestream,frankrowe/tilestream,makinacorpus/tilestream,staltz/tilestream,staltz/tilestream,zhm/tilestream,NolaMark/tilestream,mapbox/tilestream,NolaMark/tilestream,markng/tilestream