#10 #14 [ok]

add attachment feature,
1) upload, delete,
2) link attach into content (include tinymce & markdown)

markdown-editor.js add insertLink function to add link into markdown
content, usage:
MarkdownEditor.insertLink(link, title)

paste plugin edit for safety image

public/tinymce/plugins/paste/plugin.dev.js

@@ -117,4 +117,4 @@
 	writeScripts();
 })(this);
 
-// $hash: cbcf61872b3ecc41bd22dcf691e2e4dd
+// $hash: 3d47d6168ca064ff0c3f626e575ff2e8