Update compile.js

fix fex-team#1266
增加小程序image，cover-image路径解析支持

lib/compile.js

@@ -408,8 +408,8 @@ function extCss(content, callback, file) {
  * 标准化处理 html 内容, 识别各种语法，并将其转换成中间码。
  *
  * - `<!--inline[path]-->` to embed resource content
- * - `<img|embed|audio|video|link|object ... (data-)?src="path"/>` to locate resource
- * - `<img|embed|audio|video|link|object ... (data-)?src="path?__inline"/>` to embed resource content
+ * - `<img|image|cover-image|embed|audio|video|link|object ... (data-)?src="path"/>` to locate resource
+ * - `<img|image|cover-image|embed|audio|video|link|object ... (data-)?src="path?__inline"/>` to embed resource content
  * - `<script|style ... src="path"></script|style>` to locate js|css resource
  * - `<script|style ... src="path?__inline"></script|style>` to embed js|css resource
  * - `<script|style ...>...</script|style>` to analyse as js|css
@@ -420,7 +420,7 @@ function extCss(content, callback, file) {
  * @memberOf fis.compile
  */
 function extHtml(content, callback, file) {
-  var reg = /(<script(?:(?=\s)[\s\S]*?["'\s\w\/\-]>|>))([\s\S]*?)(?=<\/script\s*>|$)|(<style(?:(?=\s)[\s\S]*?["'\s\w\/\-]>|>))([\s\S]*?)(?=<\/style\s*>|$)|<(img|embed|audio|video|link|object|source)\s+[\s\S]*?["'\s\w\/\-](?:>|$)|<!--inline\[([^\]]+)\]-->|(<!(?:--)?\[[^>]+>)|<!--(?!\[|>)([\s\S]*?)(-->|$)|\bstyle\s*=\s*("(?:[^\\"\r\n\f]|\\[\s\S])+"|'(?:[^\\'\n\r\f]|\\[\s\S])+')/ig;
+  var reg = /(<script(?:(?=\s)[\s\S]*?["'\s\w\/\-]>|>))([\s\S]*?)(?=<\/script\s*>|$)|(<style(?:(?=\s)[\s\S]*?["'\s\w\/\-]>|>))([\s\S]*?)(?=<\/style\s*>|$)|<(img|image|cover\-image|embed|audio|video|link|object|source)\s+[\s\S]*?["'\s\w\/\-](?:>|$)|<!--inline\[([^\]]+)\]-->|(<!(?:--)?\[[^>]+>)|<!--(?!\[|>)([\s\S]*?)(-->|$)|\bstyle\s*=\s*("(?:[^\\"\r\n\f]|\\[\s\S])+"|'(?:[^\\'\n\r\f]|\\[\s\S])+')/ig;
   callback = callback || function(m, $1, $2, $3, $4, $5, $6, $7, $8, $9, $10) {
     if ($1) { //<script>
       var embed = '';