DOC: Adding Panel docs to API, and shortening line length in panel.py
In it goes. 

If your editor supports it, try to eliminate dangling whitespace at the end of lines,
it drives us emacs users crazy :)

05a6f8e.

Again, you're welcome to work on anything you like.  But if you want to take a dip into
code while still helping clean up the docs, maybe #3338 would be a good choice.

Thanks again.
 @changhiskhan , can you please do a website docs refresh when you get a chance?
