Adding images and nbpackage
Updating interact exercises.
Removed overly detailed notebooks
Re-add first removed notebook from last commit
Moved answers into solns dir
Updated index file
Updated widgets notebook to use new solns
Moved interact answers into solns
Use load instead of loadpy,
fix some bugs in slns
Working on BG jobs.
Working on IPython Kernel tutorials.
Work on display notebooks.
Work on display exercises.
Moving soln.
Adding custom display logic stuff.
Removing old notebooks that have been moved to examples.
Finishing up things...
Rename.
Final index changes.
Last minute changes.