Shell out for copying as Ruby's [Fileutils#cp_r] is broken.

Discusson on the Ruby oddity can be found here
http://tickets.opscode.com/browse/CHEF-833.
Fix Foreman::Procfile#entries call.
Globally replace buggy FileUtils.cp_r - see ddollar/mason/#13
Tighten up changes for pull request
Kill one more spurious FileUtils.rm_rf that I missed
Merge remote-tracking branch 'cpr/fix-symlink-copying'