Template updates

A couple things of interest are done with the template:

- HTML header
- Markdown cell with instructions as to read/write data from galaxy
- A HIDDEN javascript function to save to galaxy
- Empty cell for next user command.

The hidden javascript function is done by writing the function as part of the notebook and removing
the input text. This is probably very, very fragile and will not survive a closing+reopening but
it's very pleasant looking to just have a button that saves the notebook to galaxy. It's very
visually unobtrusive and that may be more important for new users than having the full code there.

To be able to interact with that button it is required that ipython trust the notebook. This is done
in an update to the docker startup script.