Html mixed with markdown when making an UL

[guillaume-fr]

1. Open http://hallojs.org/demo/markdown/

2. Select, inside the wysiwyg editor the text

   Actually, this text you're reading has Hallo loaded. To try it out, just click here and start writing. If you want to make more comprehensive modifications, just select some text.

3. Click on the UL button from the toolbar

4. Check in the text area, the generated markdown contains HTML :
   * <span style="font-size: 16pt; line-height: 21pt; text-indent: 2em;">Actually, this text you're reading has Hallo loaded. To try it out, just click here and start writing. If you want to make more comprehensive modifications, just select some text.</span>

The markdown should not contains a span