Consecutive anchors get separating spaces stripped.

If you have markup like this:

```html
<a href="http://modernnerd.net" title="Title">Modern Nerd</a> <a href="http://modernnerd.net" title="Title">Modern Nerd</a>
```
(note there is a space between the A tags) it gets converted to:

```markdown
[Modern Nerd](http://modernnerd.net "Title")[Modern Nerd](http://modernnerd.net "Title")
```

which has no space between the tags.

This PR only adds a failing test, I don't have a solution as yet.