Changed the depdendency from a dash to a forward slash.

With the dash in the Module require line, librarian-puppet does this:

My Puppet file contained:

```
mod 'thias/fooacl'
```

(among other, but working, modules).

Here's what happened:

```
[root@centos64 puppet]# !librar
librarian-puppet  install
/usr/lib/ruby/gems/1.8/gems/librarian-puppet-0.9.14/lib/librarian/puppet/source/forge.rb:186:in `api_call': Error requesting http://forge.puppetlabs.com/api/v1/releases.json?module=puppetlabs-concat: 400 Bad Request (OpenURI::HTTPError)
	from /usr/lib/ruby/gems/1.8/gems/librarian-puppet-0.9.14/lib/librarian/puppet/source/forge.rb:155:in `api_data'
	from /usr/lib/ruby/gems/1.8/gems/librarian-puppet-0.9.14/lib/librarian/puppet/source/forge.rb:29:in `versions'
```

That's because the module should (in this case) be specified with a /.

I forked this module to make this quick fix as it was blocking further work.

```
[root@centos64 puppet]# librarian-puppet  install
[root@centos64 puppet]# vim Puppetfile
```

librarian-puppet is quite indicating success.