Improve small details in specs:

* Fix coding standards;
* Simplify some expectations (eq instead of be matcher);
* Expect identity on block instead of calling;
* Change some before call as oneliners;
* Avoid shadowing variable names;
* Improve wording where needed.

spec/producer/core/env_spec.rb

@@ -41,7 +41,7 @@ module Producer::Core
       end
 
       it 'returns the remote' do
-        remote = double('remote')
+        remote = double 'remote'
         allow(Remote).to receive(:new) { remote }
         expect(env.remote).to eq remote
       end