Update geom package to use new extent structure

src/ol/geom/linestring.js

@@ -126,7 +126,7 @@ ol.geom.LineString.prototype.getBounds = function() {
         maxY = y;
       }
     }
-    this.bounds_ = [minX, maxX, minY, maxY];
+    this.bounds_ = [[minX, minY], [maxX, maxY]];
   }
   return this.bounds_;
 };