Drop dependency on puppetlabs/stdlib to v3.2.0+

Hi @sherzberg,

There's a bug in the puppetlabs/stdlib module that requires us to
pull the version 4 release. Unfortunately, this means that your
module will not cleanly download from the Puppet Forge without
modification. This patch modifies your Modulefile to depend on
stdlib versions 3.2.0 or higher. When version 4 is reintroduced, it
will again be installed by consumers of your module. I apologize for
the inconvenience. For your reference, here's our documentation on
Modulefile format. http://docs.puppetlabs.com/puppet/2.7/reference/modules_publishing.html

I hope this isn't too much trouble for you to merge in and base a new release to the Puppet Forge on. We'll be pulling puppetlabs/stdlib version 4 tonight.