Put escript options under :escript in the project config

From the ["spec"](http://daringfireball.net/projects/markdown/syntax#list):

> List markers typically start at the left margin, but may be indented by up to three spaces. List markers must be followed by one or more spaces or a tab.

...

> List items may consist of multiple paragraphs. Each subsequent paragraph in a list item must be indented by either 4 spaces or one tab

So for multi-paragraph lists to work they need to look like this:

```
* list item

* another one

    Second paragraph of second list item
```

Or like this (better):
```
  * list item

  * another one

    Second paragraph of second list item
```

I'm going to compare behaviour of some existing implementations next.