Add comment header to matchers library
Add Rake better automate testing locally & via Travis CI

Paves the way for additional testing automation as well
Add unit testing via ChefSpec

Berkshelf is also added to make ChefSpec tests easy to run
Add integration testing via Test Kitchen & Serverspec

Integration testing for:

* Ubuntu 12.04
* Ubuntu 14.04
* CentOS 5.10
* CentOS 6.5
Merge branch add-test-goodies from @evertrue
Update specs to match the changes I've made
Merge branch add-header-to-matchers from @evertrue
Bump version to 0.5.1

Also tweak the short description to be less generic.