Trim search string before use

The `window.location.search` string includes the "?" symbol.  Without this change, `createFromQueryData` only works if the "renderer" parameter is not in first position (see 4037bafc45).

test/spec/ol/map.test.js

@@ -8,6 +8,54 @@ goog.require('ol.View2D');
 goog.require('ol.layer.TileLayer');
 goog.require('ol.source.XYZ');
 
+describe('ol.RendererHints', function() {
+
+  describe('#createFromQueryData()', function() {
+
+    var savedGoogGlobal;
+
+    beforeEach(function() {
+      savedGoogGlobal = goog.global;
+      goog.global = {};
+    });
+
+    afterEach(function() {
+      goog.global = savedGoogGlobal;
+    });
+
+    it('returns defaults when no query string', function() {
+      goog.global.location = {search: ''};
+      var hints = ol.RendererHints.createFromQueryData();
+      expect(hints).toBe(ol.DEFAULT_RENDERER_HINTS);
+    });
+
+    it('returns defaults when no "renderer" or "renderers"', function() {
+      goog.global.location = {search: '?foo=bar'};
+      var hints = ol.RendererHints.createFromQueryData();
+      expect(hints).toBe(ol.DEFAULT_RENDERER_HINTS);
+    });
+
+    it('returns array of one for "renderer"', function() {
+      goog.global.location = {search: '?renderer=bogus'};
+      var hints = ol.RendererHints.createFromQueryData();
+      expect(hints).toEqual(['bogus']);
+    });
+
+    it('accepts comma delimited list for "renderers"', function() {
+      goog.global.location = {search: '?renderers=one,two'};
+      var hints = ol.RendererHints.createFromQueryData();
+      expect(hints).toEqual(['one', 'two']);
+    });
+
+    it('works with "renderer" in second position', function() {
+      goog.global.location = {search: '?foo=bar&renderer=one'};
+      var hints = ol.RendererHints.createFromQueryData();
+      expect(hints).toEqual(['one']);
+    });
+
+  });
+});
+
 describe('ol.Map', function() {
 
   describe('dispose', function() {