Merge pull request #1027 from tschaub/closure-util

Use the closure-util package.  Documentation will come when this is a more complete solution.  See #1027 for basic usage instructions.

test/spec/ol/renderer/webgl/webglimagelayerrenderer.test.js

@@ -12,6 +12,8 @@ describe('ol.renderer.webgl.ImageLayer', function() {
     var imageExtent;
 
     beforeEach(function() {
+      ol.proj.common.add();
+
       map = new ol.Map({
         target: document.createElement('div')
       });
@@ -80,6 +82,7 @@ goog.require('goog.dispose');
 goog.require('goog.vec.Mat4');
 goog.require('goog.vec.Vec4');
 goog.require('ol.Map');
+goog.require('ol.proj.common');
 goog.require('ol.layer.Image');
 goog.require('ol.source.Image');
 goog.require('ol.renderer.webgl.ImageLayer');