Convert specs to RSpec 3.0.2 syntax with Transpec

This conversion is done by Transpec 2.3.1 with the following command:
    transpec

* 1 conversion
    from: describe 'some model' { }
      to: describe 'some model', :type => :model { }

* 1 conversion
    from: it { should ... }
      to: it { is_expected.to ... }

For more details: https://github.com/yujinakayama/transpec#supported-conversions
pass slow test green
correct some deprecated specs and guard extras