Use a resource guard instead of vanilla Ruby

More Chef-like, and ensures the resource exists, even if it’s not
acted on
Merge pull request #9 from evertrue/use-guard

Use an `only_if` guard instead of vanilla Ruby
Merge pull request #7 from evertrue/add-tests

Add tests using RuboCop, Food Critic, ChefSpec, & Test Kitchen
Delete 32-bit wrapper on all Debian-like systems

Fix an issue where Archiva won't start on Debian if this file is present.
Add Travis integration testing