Rewrite of sysctl cookbook, includes test-kitchen suite for testing LWRPs using a test cookbook & serverspec

Here's my latest rewrite pull request. I added serverspec tests for the LWRPs with an additional 'lwrps' test suite, and pulled in Ryan's changes to switch from Strainer to rake. It required I add some additional dependencies, and I also got the LWRPs working again before adding the tests.