Adds -iso to virtualbox in the template.json file, rumor has it that packer fix will get the trick done, but had to manually change it.  only tested on archlinux-x86_64.  Worked and was able to run vagrant up and vagrant ssh into the machine
Merge pull request #2 from jahrik/master

Adds -iso to virtualbox in the template.json file, rumor has it that pac...