Allow extents to restrict tile ranges requested from the server

The addition of full extent tile ranges also allows us to simplify wrapX
handling for tile layers. By limiting wrapX to true and false as possible
values, we can remove a lot of guessing logic.

src/ol/attribution.js

@@ -78,8 +78,8 @@ ol.Attribution.prototype.intersectsAnyTileRange =
       if (testTileRange.intersects(tileRange)) {
         return true;
       }
-      var extentTileRange = tileGrid.getTileRange(
-          parseInt(zKey, 10), projection);
+      var extentTileRange = tileGrid.getTileRangeForExtentAndZ(
+          projection.getExtent(), parseInt(zKey, 10));
       var width = extentTileRange.getWidth();
       if (tileRange.minX < extentTileRange.minX ||
           tileRange.maxX > extentTileRange.maxX) {