Use namespaces for tests

With this commit test files provide namespaces (using goog.provide). This fixes the issue reported by @bartvde where goog objects cannot be used in Jasmine "describe" functions. It also frees us from having to add script tags for the test files in test/ol.html.

test/spec/ol/view2d.test.js

@@ -1,4 +1,4 @@
-goog.require('ol.View2D');
+goog.provide('ol.test.View2D');
 
 describe('ol.View2D', function() {
   describe('create constraints', function() {
@@ -51,3 +51,5 @@ describe('ol.View2D', function() {
     });
   });
 });
+
+goog.require('ol.View2D');