Fix #196 #207

tests/oauth2.js
  [remove] https never used
  [add] https url testing
lib/oauth2.js
  [remove] creds never used

tests/oauth2.js

@@ -1,6 +1,5 @@
 var vows = require('vows'),
     assert = require('assert'),
-    https = require('https'),
     OAuth2= require('../lib/oauth2').OAuth2,
     url = require('url');
 
@@ -210,5 +209,14 @@ vows.describe('OAuth2').addBatch({
           oa.get("", {});
         }
       }
+    },
+    'HTTPS URL connection testing, ': {
+      topic: function() {
+        var oa = new OAuth2("clientId", "clientSecret");
+        oa._request('GET', 'https://www.bing.com/', {}, null, '', this.callback);
+      },
+      'we should correctly get the response code == 200': function(error, result, response) {
+        assert.equal(response.statusCode, 200);
+      }
     }
 }).export(module);