Web content and examples for 0.6

Hi guys,
I am still working on this but I thought it was good idea to share it as I write it so you can all have a look. In addition it would be great if we could all add some examples.
What is called nii_2_tracks.py was doing quite a lot of things. I thought it would be much easier for people who want to learn dipy to break it into smaller parts.
Let me know what you think.