Remove she-bang line.
Use consistent imports
Remove unnecessary code comments.
Remove unnecessary calls to `show`
Rmove unused variable
Split up hist examples into two sections.

The original example was trying to do too much in one place.
Remove use of `setp` in favor of keyword args.
Replace multiple figures with subplots
Change bin edges to make the example clearer.
Add titles to clarify intent
Simplify example
Split demo that tried to do too much
Remove unnecessary second histogram
Remove unnecessary parameters
PEP8 fixes
Add example docstrings
Simplify example.

Remove plot of exact PDF since this is already demoed in another example.
Clarify title of plot
Move histogram examples to statistics directory
Fix example links.

The example linked in backend_driver was broken when examples were
split up and renamed/moved.