Vim: update plugins in ~/.janus to latest versions
Bash:only set Terminal tab title, not window title

The window's titlebar already has the current directory (thanks to
$PROMPT_COMMAND informing Terminal.app of the CWD, in /etc/bashrc), so
putting the full path into it is redundant. We now just set to the
tab's title to the basename of the CWD.
Bash: remove tools-osx from path, reindent profile

The only tool we really used from that suite was `trash`, and we can
get a better `trash` utility from homebrew.
Bash: Add `spell` command to check word spelling
Bash: add verbose mode to `hman` command
Bash: `brew clean` prints progress, `rm`s cache

In `brew-wrapper`, we now print banners & dividers explaining what
we're doing when we do a `brew clean`. We also trash the cache by
default, because `brew cleanup -s` didn't seem to be getting the job
done.