Dynamic images

Hi Ben! I removed my code from 'app.py' just to make sure I did not introduce any bugs into Edward. As of now, it should be safe (and fast-foward) to merge my branch into master, though not functional. Still I think it would be nice to have it there. I've also added a wiki page with the code snippets that need to be introduced into 'app.py' in case someone wants to experiment with the indicators in the future.

Hope you are fine, cheers!

p.s. Attached you'll find an image (a crop from the original logo) which would be nice to add to the versioning goat's account, since the Github default is not really entertaining.
![logo](https://f.cloud.github.com/assets/1661017/576532/d5662d38-c807-11e2-8e47-2e8026f64da9.png)