Fix Berkshelf and pin versions in Gemfile

Berkshelf was unbound in the Gemfile, but still had the older 2.X
format in the metadata.  I pinned all the versions in the Gemfile and
updated the Berksfile to the new format
Fix Berkshelf and pin versions in Gemfile

Berkshelf was unbound in the Gemfile, but still had the older 2.X
format in the metadata.  I pinned all the versions in the Gemfile and
updated the Berksfile to the new format
Rubocop fix to the tail resource file
Merge branch 'master' of https://github.com/tas50/cookbook-beaver
Merge pull request #11 from tas50/master

Fix Gemfile / Berkshelf and a minor rubocop fix