Bonus pack (place link before, per node-type placement, per node-type css)

Hi Guys!

I do like this module, but my costumers needed some extra features which might come handy for other users too, so I attach my patch.

It does the following:
- allows per node-type csses by adding read-more- class to link's css
- allows the link to be placed BEFORE the node (it gets placed in a div)
- allows entering of PHP code to decide on the placement of the link based on $node during the rendering.

I hope you like these ideas and include the patch in new dev releases.

Cheers,
Peter