Add an example of aliasing an imported package.

This allows you to write such things as S.Date, which would refer to
java.sql.Date.
Add an example of importing all of an object but renaming one member.

All of bobsdelights.Fruits is imported, but Apple is renamed to
McIntosh.
Add an example of importing all but one member of a package.

The statement, import bobsdelights.Fruits.{Pear => _, _} has the effect
of importing all of bobsdelights.Fruits, except for Pear.