修复一处正则表达式错误（坑了4年的bug，好像也没影响）

Author: LiarOnce

.gitignore

@@ -1 +1,2 @@
-upload/qiniu/config.php
+upload/qiniu/config.php
+.jshintrc

editormd/editormd.js

@@ -3833,7 +3833,7 @@
     callback = callback || function() {}
     var script = null
     script = document.createElement("script")
-    script.id = fileName.replace(/[\./]+/g, "-")
+    script.id = fileName.replace(/[\.\/]+/g, "-")
     script.type = "text/javascript"
     script.src = fileName + ".js"
     if (editormd.isIE8) {