Added support for rdiscount

**Added support for rdiscount markdown titles** (check line 15)

*This is a new file because it's not compatible with the other version.*

Could be needed to specify the place of the main content of the page in the headers depending of the theme to prevent to break the TOC.

For example you may need to replace
```js
var headers = $('h1, h2, h3, h4, h5, h6').filter(function() {
```
by
```js
var headers = $(' .content h1, .content h2, .content h3, .content h4, .content h5, .content h6 ').filter(function() {
```
The changes have been made to follow your recommendation, it works fine!