feat:1、修复无数据时报错的问题。

2、新增自定义代码着色格式
3、新增自动加载配置文件

static/editor.md/lib/highlight/languages/tex.js

@@ -0,0 +1,68 @@
+/*
+Language: TeX
+Author: Vladimir Moskva <vladmos@gmail.com>
+Website: http://fulc.ru/
+Category: markup
+*/
+
+function(hljs) {
+  var COMMAND = {
+    className: 'tag',
+    begin: /\\/,
+    relevance: 0,
+    contains: [
+      {
+        className: 'name',
+        variants: [
+          {begin: /[a-zA-Zа-яА-я]+[*]?/},
+          {begin: /[^a-zA-Zа-яА-я0-9]/}
+        ],
+        starts: {
+          endsWithParent: true,
+          relevance: 0,
+          contains: [
+            {
+              className: 'string', // because it looks like attributes in HTML tags
+              variants: [
+                {begin: /\[/, end: /\]/},
+                {begin: /\{/, end: /\}/}
+              ]
+            },
+            {
+              begin: /\s*=\s*/, endsWithParent: true,
+              relevance: 0,
+              contains: [
+                {
+                  className: 'number',
+                  begin: /-?\d*\.?\d+(pt|pc|mm|cm|in|dd|cc|ex|em)?/
+                }
+              ]
+            }
+          ]
+        }
+      }
+    ]
+  };
+
+  return {
+    contains: [
+      COMMAND,
+      {
+        className: 'formula',
+        contains: [COMMAND],
+        relevance: 0,
+        variants: [
+          {begin: /\$\$/, end: /\$\$/},
+          {begin: /\$/, end: /\$/}
+        ]
+      },
+      hljs.COMMENT(
+        '%',
+        '$',
+        {
+          relevance: 0
+        }
+      )
+    ]
+  };
+}