Issue with end of p fields

Hi. Just noticed that your script to parse the markdown and add your own divs leaves the </p> in the html code. 

Your code should probably be someting like:

```
   html.gsub!(/^<p>\[(.*?)\/\]<\/p>/m, '<div class="\1"></div>')
```

instead of 

```
    html.gsub!(/^<p>\[(.*?)\/\]/m, '<div class="\1"></div>')
```

Thanks for this utility !
