Chefdk update

Update the sample cookbook to the new toolchain (ChefDK 0.1.1, Ruby 2.0, Berks 3, Stove 3, Vagrant 1.6, etc..)

Changelog:
* Rename cookbook to "sample-toplevel-cookbook"
* Update to Ruby 2.0 / Berkshelf 3
* Update to latest gems for cookbook testing
* Update to latest cookbooks in metadata
* Update to Chef 11.12.8 in test-kitchen and Vagrantfile
* Switch to 10.x.x.x network in Vagrantfile