Add Berkshelf, RuboCop, Test Kitchen, etc.

* Config to test Ubuntu 12.04 & Debian 7.2
* RuboCop config to set code style expectations
* Minimal Berksfile
* Rakefile with handy test tasks
Add ChefSpec tests, use bleeding-edge ark

Need the bleeding edge ark so we have access to the ChefSpec matchers
that haven't landed in a released version yet.

Courtesy of that unreleased ark, some breaking changes to the LWRP:

* Add ark prefix_home to deal w/ ark changes
Add Travis CI style & unit testing
Add ServerSpec tests
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
Upgrade to Archiva 2.1.1

* Update jetty.xml config from Archiva 2.x package
* Update ChefSpec
* Ensure Java 7 is, in fact, installed
    - Java 7 (aka JDK 1.7) is required by Archiva 2.x
* Ensure all 32-bit things are removed
    - Lifted from the “official” Puppet module:
    - https://github.com/maestrodev/puppet-archiva/blob/d64f752f0cb445b7190357757eb5e83201590f89/manifests/init.pp
Merge pull request #8 from evertrue/upgrade-to-2.1.1

Upgrade to Archiva 2.1.1
Delete 32-bit wrapper on all Debian-like systems

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

Also, gets back to using a Chef `only_if` guard as per #7
Use chef-solo for ChefSpec tests to increase speed
Merge pull request #6 from evertrue/fix-debian-64bit

Delete 32-bit wrapper on all Debian-like systems
Use chef-sugar to guard file deletion

Less is more