Making the README.md look nicer.

I was able to make the image and link work on the README.md by changing the HTML to the simpler markdown format. 

Old HTML:

    <a href="http://en.wikipedia.org/wiki/File:Jean_Auguste_Dominique_Ingres_019.jpg">
    <img width="640" src="./node-romulus/raw/master/romulus.jpg">
    </a>

New Markdown:

    [![Romulus](romulus.jpg)](http://en.wikipedia.org/wiki/File:Jean_Auguste_Dominique_Ingres_019.jpg)


This looks like a great project that I'd like to contribute to in the future if I have the time, hoping to get it more attention by making the README look nicer.