Replace fitGeometry and fitExtent with fit

Fit accepts either a geometry or an extent.

This combines two previously distinct functions
into one more flexible call.

Also brings the rotations support and options
previously available to fitGeometry to extents

examples/drag-and-drop-image-vector.js

@@ -122,7 +122,7 @@ dragAndDropInteraction.on('addfeatures', function(event) {
       style: styleFunction
     })
   }));
-  map.getView().fitExtent(
+  map.getView().fit(
       vectorSource.getExtent(), /** @type {ol.Size} */ (map.getSize()));
 });