Upgraded to 0.7.2 Packer plus minor tweaks:

Vagrantfile
-Vagrant was complaining about not finding Berksfile (ChefDK 0.3.5) so I had to specify the path
-Vagrant complained that max_tries and timeout needed to be commented out...so I commented them out!

attributes/default.rb
-Updated to 0.7.2 Hashes and updated version
-Added logic to download file naming scheme, newer versions are prefixed with "packer_"
-Moved complete "file_url" as an attribute instead of specified in the recipe.

recipes/default.rb
-Now using new "file_url" from attributes

test/integration/default/bats/packer_installed.bats
-Added bats test to confirm packer was installed