WIP (For comments) Transform <newline> in cnxml to html

Transforms:

```
<newline />
<para>hello</para>
<newline count="3" />
<para>lines</para>
<newline count="5" effect="underline" />
```

to:

```
<br/>
<p class="para">hello</p>
<br/><br/><br/>
<p class="para">lines</p>
<hr/><hr/><hr/><hr/><hr/>
```

I looked at http://cnx.org/eip-help/newline.

`<space>` has a similar transformation (in terms of having count and effect), so if this is about right, I can get to `<space>`.

I know this is not the most important tag etc but I'm trying to learn xslt.  I'll be working on `<list>`.