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/protobuf.js

@@ -0,0 +1,42 @@
+/*
+Language: Protocol Buffers
+Author: Dan Tao <daniel.tao@gmail.com>
+Description: Protocol buffer message definition format
+Category: protocols
+*/
+
+function(hljs) {
+  return {
+    keywords: {
+      keyword: 'package import option optional required repeated group',
+      built_in: 'double float int32 int64 uint32 uint64 sint32 sint64 ' +
+        'fixed32 fixed64 sfixed32 sfixed64 bool string bytes',
+      literal: 'true false'
+    },
+    contains: [
+      hljs.QUOTE_STRING_MODE,
+      hljs.NUMBER_MODE,
+      hljs.C_LINE_COMMENT_MODE,
+      {
+        className: 'class',
+        beginKeywords: 'message enum service', end: /\{/,
+        illegal: /\n/,
+        contains: [
+          hljs.inherit(hljs.TITLE_MODE, {
+            starts: {endsWithParent: true, excludeEnd: true} // hack: eating everything after the first title
+          })
+        ]
+      },
+      {
+        className: 'function',
+        beginKeywords: 'rpc',
+        end: /;/, excludeEnd: true,
+        keywords: 'rpc returns'
+      },
+      {
+        begin: /^\s*[A-Z_]+/,
+        end: /\s*=/, excludeEnd: true
+      }
+    ]
+  };
+}