Headlines must have a space after the stars

It seems headlines must have a space after the stars.

```
***not ok
*** ok
```

![image](https://cloud.githubusercontent.com/assets/24027/4415735/4cd9927c-4531-11e4-9f90-e69f2deeba3a.png)
Have you tested this? AFAIK String.matches() will only return true if the entire string matches the regular expression.