增加微信登录样式 code review by @bikai

@@ -48,6 +48,9 @@
                         </span>
                     </li>
                     <li class="third-party-login">
+                        <a href="{{weixinLogin}}">
+                            <span class="icon weixin"></span>
+                        </a>
                         <a href="{{qqLogin}}">
                             <span class="icon qq"></span>
                         </a>

@@ -86,7 +86,7 @@ $third: sprite-map("passport/third/*.png");
 
         a {
             display: table-cell;
-            width: 54px;
+            width: 45px;
             background-size: 100% 100%;
         }
 
@@ -97,6 +97,10 @@ $third: sprite-map("passport/third/*.png");
             margin: 0 auto;
         }
 
+        .weixin {
+            background: sprite($third, weixin) no-repeat;
+        }
+
         .qq {
             background: sprite($third, qq) no-repeat;
         }

@@ -61,6 +61,7 @@ class LoginController extends AbstractAction
                 'countryList' => RegData::getAreasData(),
                 'forgetPwd' => Helpers::url('/passport/back/index'),
                 'fastReg' => Helpers::url('/reg.html'),
+                'weixinLogin' => Helpers::url('/passport/autosign/weixin'),
                 'qqLogin' => Helpers::url('/passport/autosign/qq'),
                 'weiboLogin' => Helpers::url('/passport/autosign/sina'),
                 'alipayLogin' => Helpers::url('/passport/autosign/alipay'),