Less context

This change removes all changes that were anticipated here for
WMS GetFeatureInfo handling, including the IWMS interface and
the goog.provide for 'ol.tilegrid'. I'll create a separate pull
request for WMS GetFeatureInfo eventually, taking into account
the suggestions from the discussion in #402.

test/spec/ol/tilegrid/tilegrid.test.js

@@ -660,5 +660,4 @@ goog.require('ol.Extent');
 goog.require('ol.Size');
 goog.require('ol.TileCoord');
 goog.require('ol.projection');
-goog.require('ol.tilegrid');
 goog.require('ol.tilegrid.TileGrid');