export to Latex enhancemnet.

When exporting to Latex, the user gets a plain tex file made from the markdown. This is O.K. when the page has no images in it. However, when the page contains some images, it would be really a great enhancement if the output of the conversion will be zipped together with the imgags, e.g. When exporting a page called "Test.page" which has the images "pic1.png" and "pic2.png" the output of the export would be "Test.zip", containing all the three files:

```
Test.tex,
pic1.png
pic2.png
```

Thanks, Oz