The user is able to type [ or ]

There are many workarounds[1] to the

    zsh: no matches found: ...

issue, but let's just stop it at its core: turn off that `nomatch`
functionality.

Apologies to all who enjoy seeing the pun around:

    % got a light?
    zsh: no matches found: light?

But all good shell puns[2] must come to an end.

[1] http://robots.thoughtbot.com/post/18129303042/how-to-use-arguments-in-a-rake-task
[2] http://www-users.cs.york.ac.uk/susan/joke/unix.htm