Removing Markdown Cell notebook.
Removing Typesetting notebook.
Removing content as it moves to ipython/examples.
update links
Finished spinner example
renamed:    Interact.ipynb -> Using Interact.ipynb
Added fab file to update tuts/examples from ipython/master
Removing moved content.
Removing moved content.
Adding Notebook exercises.
Removing moved content.
Renaming notebooks.
File rename.
renamed:    Simple Widgets.ipynb -> Widget Basics.ipynb
deleted:    Custom Widget - Spreadsheet.ipynb
Updated whitelist
Updating notebook exercises.
Merge branch 'master' of github.com:ipython/ipython-in-depth
Copying over files in Notebook.
Added widget exercises