修复若干问题 (#229)

* 优化图标和LOGO

* 修改登录页面动画的速度为3

* 增加对websocket的异常处理

* 修复了用户组和用户名唯一判断错误的问题

* 提示版本号

web/src/components/Login.js

@@ -169,7 +169,7 @@ class LoginForm extends Component {
                                 enable: true,
                                 outMode: "bounce",
                                 random: false,
-                                speed: 6,
+                                speed: 3,
                                 straight: false,
                             },
                             number: {

web/src/components/access/Access.js

@@ -444,6 +444,7 @@ class Access extends Component {
         client.onstatechange = this.onClientStateChange;
 
         client.onerror = this.onError;
+        tunnel.onerror = this.onError;
 
         // Get display div from document
         const display = document.getElementById("display");

web/src/images/logo.svg

@@ -1,10 +1,9 @@
-<svg width="130" height="140" xmlns="http://www.w3.org/2000/svg">
+<svg width="128" height="128" xmlns="http://www.w3.org/2000/svg">
     <g fill="none">
-        <path fill="#40a9ff" d="M 10 10 V 110 L 65 135 L 120 110 V 10 Z"/>
         <g fill="none">
-            <path fill="#40a9ff" d="M 10 10 V 110 L 65 135 L 120 110 V 10 Z"/>
-            <path fill="white" d="M 65 50 l -55 20 v 20 l 55 -20 l 55 20 v -20 l -55 -20 Z"/>
-            <path fill="#0050b3" d="M 65 70 l -55 20 v 20 l 55 25 l 55 -25 v -20 l -55 -20 Z"/>
+            <path fill="#40a9ff" d="M 9 0 v 95 l 55 30 l 55 -30 v -95 h -90 z"/>
+            <path fill="white" d="M 64 35 l -55 25 v 20 l 55 -25 l 55 25 v -20 l -55 -25 z"/>
+            <path fill="#0050b3" d="M 64 55 l -55 25 v 15 l 55 30 l 55 -30 v -15 l -55 -25 z"/>
         </g>
     </g>
 </svg>