Fix broken redirect on latest chef

Starting with a chef version 11.10 remote_file is broken for github download links.
You would get `Chef::Exceptions::RedirectLimitExceeded`. 

There is an issue describing this behavior https://tickets.opscode.com/browse/CHEF-5010?focusedCommentId=48183&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-48183

This pull-request works around the issue by using a direct link.