creationix/nvm — pull request #132 by tlevine (2012-08-22 14:11:38+00:00)
Title: Hide the which error that occurred when I sourced nvm.sh in bash

Before this, this error occurred in bash.
```#!sh
$ . nvm.sh
which: no unsetopt in (/home/tlevine/opt/nvm/v0.6.16/bin:/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/sbin:/usr/bin/vendor_perl:/usr/bin/core_perl:~/bin:~/.gem/ruby/1.9.1/bin:~/bin:~/.gem/ruby/1.9.1/bin)

$ bash --version
GNU bash, version 4.2.37(2)-release (x86_64-unknown-linux-gnu)
Copyright (C) 2011 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later

This is free software; you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
```
Of course, this could make debugging harder down the line, so maybe we should send the output to a log or something.