This reverts commit cf358d8fd398841764006dc5dbe0daeebecac572, reversing
changes made to 8eace445a7.

One idea for why the database is occasionally purged is due to the
temporary file being on a separate device than the database. This
patch implements @lilydjwg's suggestion here:

    https://github.com/wting/autojump/issues/391#issuecomment-419349650

Autojump has been available since Debian Wheezy which is now stable.

Pandoc treats both underscores and dollar signs as non-literal
characters which screwed up the manpage.

because tests have been removed

Closes #178.

Closes #156.

I've updated the documentation to notify end users to add compinit to their
~/.zshrc if they want tab completion.

--stat added, jumpstat alias removed.

Options passed to the `j` function will now be passed on autojump. As a result,
directories beginning with `-` are no longer supported.

A -s short alias for --stat is added. Instead of using jumpstat, use `j --stat`
or `j -s` instead.