Parse PBF directly in ol.format.MVT

This change also fixes a previous issue, where MultiPolygon geometries for
ol.Feature features were never created.

src/ol/source/vectortile.js

@@ -4,7 +4,6 @@ goog.require('ol');
 goog.require('ol.TileState');
 goog.require('ol.VectorImageTile');
 goog.require('ol.VectorTile');
-goog.require('ol.proj');
 goog.require('ol.size');
 goog.require('ol.tilegrid');
 goog.require('ol.source.UrlTile');