Depend on chefspec 3.1.0.beta.1
port to chefspec3.1
Make rubocop happy.
adopt required chefspec version
Incorporate most of sethvargos comments

 - depend on chefspec ~>3.1 instead of ~>3.1.0
 - simplify the preparation of the runner in server_spec.rb
 - linebreaks for server_spec.rb
 - improve the template and service tests in client_spec.rb
Merge pull request #28 from bcs-de/chefspec-3.1

Chefspec 3.1