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/clean.js

@@ -0,0 +1,31 @@
+/*
+Language: Clean
+Author: Camil Staps <info@camilstaps.nl>
+Category: functional
+Website: http://clean.cs.ru.nl
+*/
+
+function(hljs) {
+  return {
+    aliases: ['clean','icl','dcl'],
+    keywords: {
+      keyword:
+        'if let in with where case of class instance otherwise ' +
+        'implementation definition system module from import qualified as ' +
+        'special code inline foreign export ccall stdcall generic derive ' +
+        'infix infixl infixr',
+      literal:
+        'True False'
+    },
+    contains: [
+
+      hljs.C_LINE_COMMENT_MODE,
+      hljs.C_BLOCK_COMMENT_MODE,
+      hljs.APOS_STRING_MODE,
+      hljs.QUOTE_STRING_MODE,
+      hljs.C_NUMBER_MODE,
+
+      {begin: '->|<-[|:]?|::|#!?|>>=|\\{\\||\\|\\}|:==|=:|\\.\\.|<>|`'} // relevance booster
+    ]
+  };
+}